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Income Taxes - Deferred Income Taxes (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets [Abstract]    
Employee and retiree benefit plans $ 411 $ 279
Other insurance and contractholder liabilities 402 358
Loss carryforwards 255 105
Other accrued liabilities 340 101
Other 205 91
Deferred tax assets before valuation allowance 1,613 934
Valuation allowance for deferred tax assets (199) (72)
Deferred tax assets, net of valuation allowance 1,414 862
Deferred tax liabilities [Abstract]    
Depreciation and amortization 838 176
Acquisition-related basis differences 9,792 320
Policy acquisition expenses 211 190
Unrealized appreciation (depreciation) on investments and foreign currency translation (29) 102
Other 55 35
Total deferred tax liabilities 10,867 823
Net deferred income tax assets $ (9,453) $ 39