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INCOME TAXES - Income Tax Effects of Temporary Differences that Gave Rise to Deferred Income Tax Assets and Liabilities (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Deferred income tax liabilities:    
Deferred policy acquisition costs $ 2,439 $ 2,282
Unrealized gains on investment securities 2,636 1,684
Premiums receivable 111 139
Policy benefit reserves 1,638 1,313
Depreciation 70 61
Other 0 0
Total deferred income tax liabilities 6,894 5,479
Deferred income tax assets:    
Other basis differences in investment securities 1,167 1,422
Unfunded retirement benefits 13 15
Other accrued expenses 11 7
Policy and contract claims 146 113
Foreign currency loss on Japan branch 185 208
Deferred compensation 210 181
Capital loss carryforwards 3 0
Other 103 95
Total deferred income tax assets 1,838 2,041
Net deferred income tax liability 5,056 3,438
Current income tax liability 331 902
Total income tax liability $ 5,387 $ 4,340