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Income Taxes - Significant components of deferred tax assets and liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets:    
Federal net operating loss carryforwards $ 27 $ 50
Foreign underwriting losses 80 120
Capital loss carryforwards 32 83
Insurance claims and reserves 694 801
Employee benefits 84 131
Other, net 45 80
Total deferred tax assets before valuation allowance 962 1,265
Valuation allowance against deferred tax assets (109) (173)
Total deferred tax assets 853 1,092
Deferred tax liabilities:    
Investment securities (341) (307)
Deferred policy acquisition costs (202) (352)
Insurance claims and reserves transition liability (128) 0
Real estate, property and equipment (35) (45)
Total deferred tax liabilities (706) (704)
Net deferred tax asset (liability) 147 388
Excluding Unrealized Gains    
Deferred tax assets:    
Federal net operating loss carryforwards 27 50
Foreign underwriting losses 80 120
Capital loss carryforwards 32 83
Insurance claims and reserves 665 774
Employee benefits 84 131
Other, net 48 85
Total deferred tax assets before valuation allowance 936 1,243
Valuation allowance against deferred tax assets (109) (173)
Total deferred tax assets 827 1,070
Deferred tax liabilities:    
Investment securities (1) 29
Deferred policy acquisition costs (293) (448)
Insurance claims and reserves transition liability (128) 0
Real estate, property and equipment (35) (45)
Total deferred tax liabilities (457) (464)
Net deferred tax asset (liability) 370 606
Impact of Unrealized Gains    
Deferred tax assets:    
Federal net operating loss carryforwards 0 0
Foreign underwriting losses 0 0
Capital loss carryforwards 0 0
Insurance claims and reserves 29 27
Employee benefits 0 0
Other, net (3) (5)
Total deferred tax assets before valuation allowance 26 22
Valuation allowance against deferred tax assets 0 0
Total deferred tax assets 26 22
Deferred tax liabilities:    
Investment securities (340) (336)
Deferred policy acquisition costs 91 96
Insurance claims and reserves transition liability 0 0
Real estate, property and equipment 0 0
Total deferred tax liabilities (249) (240)
Net deferred tax asset (liability) $ (223) $ (218)