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Income Taxes (Components Of Deferred Tax Assets and Liabilities) (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Deferred tax liabilities [Abstract]    
Unearned premium reserve $ 75 $ 143
Deferral of cancellation of indebtedness income 14 46
Deferred acquisition costs 21 42
Net unrealized gains in accumulated other comprehensive income 0 4
Partnership basis difference 11 36
Basis difference in foreign subsidiaries 1 64
Net deferred taxes on VIEs 38 0
Other 0 27
Total gross deferred tax liabilities 160 362
Deferred tax assets [Abstract]    
Compensation and employee benefits 11 19
Accrued interest 131 177
Loss and loss adjustment expense reserves 87 142
Net operating loss 582 929
Foreign tax credit 62 7
Capital loss carryforward and other-than-temporary impairments 22 4
Net unrealized losses on insured derivatives 14 29
Net losses on financial instruments at fair value and foreign exchange 13 0
Net unrealized losses in accumulated other comprehensive income 5 6
Alternative minimum tax credit carryforward 0 26
Other 3 0
Total gross deferred tax assets 930 1,339
Valuation allowance 770 7
Net deferred tax asset $ 0 $ 970