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Income Taxes - Deferred tax assets (liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Deferred Tax Assets    
Loss reserves and tax discount $ 150 $ 104
Unearned premium reserve and other underwriting related reserves 355 352
Investment-related items 183 194
Employee benefits 287 313
General business credit carryover 1 3
Net operating loss carryover 521 710
Foreign tax credit carryover 0 26
Other 0 1
Total Deferred Tax Assets 1,497 1,703
Deferred Tax Liabilities    
Deferred acquisition costs (104) (103)
Net unrealized gains on investments (7) (306)
Other depreciable and amortizable assets (135) (130)
Other (3) 0
Total Deferred Tax Liabilities (249) (539)
Net Deferred Tax Asset $ 1,248 $ 1,164