Financial Performance - Net earnings attributable to Berkshire Hathaway shareholders in 2018 were 4.021billion,asignificantdecreasefrom44.94 billion in 2017, which included a one-time benefit of approximately 29.1billionfromtheTaxCutsandJobsAct[131].−After−taxearningsfrominsuranceunderwritingimprovedtoapproximately1.566 billion in 2018, compared to after-tax losses of approximately 2.219billionin2017,drivenbyreducedestimatedliabilitiesandlowercatastrophelosses[131].−TheeffectiveincometaxrateforBerkshireHathawayin2018was21.417.737 billion in 2018, primarily due to 18billioninlossesfromchangesinmarketvaluesofequitysecurities[133].−Netearningsfor2018were4,322 million, a significant decrease from 45,353millionin2017,reflectingadeclineofapproximately90.5247,837 million in 2018, up from 239,933millionin2017,representingagrowthofabout3.8(22,155) million, compared to a gain of 1,410millionin2017,indicatingasubstantialnegativeshift[251].BusinessSegmentsPerformance−Therailroadbusinessreporteda31.85.219 billion, reflecting increased unit volume and higher average revenue per car[131]. - After-tax earnings from manufacturing, service, and retailing businesses rose by 29% in 2018, reaching 9.364billion,supportedbya1334.123 billion in 2018, with a loss ratio of 78.8%, down 7.8 percentage points from 2017[138]. - The utilities and energy businesses reported higher after-tax earnings in 2018, attributed to a lower effective income tax rate, despite some declines in pre-tax earnings in regulated utilities[131]. - BNSF's revenues reached 23.855billionin2018,anincreaseof2.468 billion (11.5%) from 21.387billionin2017[164].−BerkshireHathawayEnergy′stotalrevenuesin2018were19.987 billion, an increase from 18.854billionin2017,withpre−taxearningsof2.472 billion[170]. Investment and Financial Position - The company held cash, cash equivalents, and U.S. Treasury Bills of approximately 109billionatyear−end2018,including85 billion in U.S. Treasury Bills[213]. - Berkshire's consolidated shareholders' equity was approximately 349billionasofDecember31,2018,adecreaseof26.9 billion since September 30, 2018[213]. - The company reported a foreign currency translation loss of 1.424billionin2018,contrastingwithagainof2.151 billion in 2017[237]. - Total liabilities rose to 355,294millionin2018,comparedto350,141 million in 2017, an increase of about 1.3%[253]. - The company maintained effective internal control over financial reporting as of December 31, 2018, as confirmed by an independent audit[240]. Claims and Liabilities - The company's consolidated claim liabilities were approximately 110billion,with8419.5 billion, with net claim liabilities of 18.6billionasofDecember31,2018[218].−Thecompanyrecordedadecreaseof222 million in claim liability estimates during 2018, resulting in a corresponding increase in pre-tax earnings[218]. - The company anticipates that a one percentage point change in bodily injury claim severities could result in a 275millionincreaseordecreaseinrecordedliabilities[218].−Thecompanyutilizesvariousactuarialestimationmethodsforclaimliabilities,includingBornhuetter−Fergusonandchain−laddermethodologies[218].AcquisitionsandInvestments−TheacquisitionofMedicalLiabilityMutualInsuranceCompanywascompletedforapproximately2.5 billion, with fair value of assets at 6.1billionandliabilitiesat3.6 billion[296]. - The total consideration for bolt-on acquisitions was approximately 1.0billionin2018,2.7 billion in 2017, and 1.4billionin2016[296].−Berkshire′sinvestmentinKraftHeinzhadafairvalueofapproximately14.0 billion as of December 31, 2018, down from 25.3billionin2017[308].−Approximately6840.3 billion[305]. Operational Metrics - Total operating expenses for BNSF increased by 1.908billion(13.616.992 billion in 2018, with a ratio of operating expenses to revenues of 66.9%[164]. - The company reported a comprehensive income of 2,059millionin2018,downfrom66,768 million in 2017, a decrease of about 96.9%[253]. - The average equivalent Class A shares outstanding remained stable at approximately 1,643,795 in 2018, compared to 1,644,615 in 2017[251]. - The company evaluated approximately 99% of loan balances as performing and 95% as current in payment status as of December 31, 2018[314].