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Income Taxes (Components Of Deferred Tax Assets and Liabilities) (Detail) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Deferred tax liabilities [Abstract]    
Unearned premium reserve $ 159 $ 196
Deferral of cancellation of indebtedness income 68 91
Deferred acquisition costs 56 72
Net unrealized gains in accumulated other comprehensive income 0 4
Partnership basis difference 30 45
Basis difference in foreign subsidiaries 40 59
Other 91 55
Total gross deferred tax liabilities 444 522
Deferred tax assets [Abstract]    
Compensation and employee benefits 19 30
Accrued interest 137 99
Loss and loss adjustment expense reserves 119 69
Net operating loss and tax credit carryforwards 972 1,150
Capital loss carryforward and other-than-temporary impairments 5 6
Net unrealized losses on insured derivatives 35 93
Net losses on financial instruments at fair value and foreign exchange 45 37
Net unrealized losses in accumulated other comprehensive income 15 0
Alternative minimum tax credit carryforward 22 22
Net deferred taxes on VIEs 14 25
Total gross deferred tax assets 1,383 1,531
Valuation allowance 0 0
Net deferred tax asset $ 939 $ 1,009