Assets and Liabilities Associated with Discontinued Operations (Detail) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Assets
Fixed maturity securities available-for-sale, at fair value	$ 60,572	$ 58,197
Other invested assets	2,071	2,309
Total investments	71,569	69,128
Cash and cash equivalents	0	28	$ 273
Accrued investment income	659	653
Reinsurance recoverable	17,755	17,245
Total assets held for sale	0	127
Liabilities
Liability for policy and contract claims	9,256	8,095
Unearned premiums	3,378	3,308
Liabilities held for sale	0	127
European Mortgage Insurance Business
Assets
Fair value less closing costs impairment		(135)
Asset Held For Sale | European Mortgage Insurance Business
Assets
Fixed maturity securities available-for-sale, at fair value	0	195
Other invested assets	0	6
Total investments	0	201
Cash and cash equivalents	0	28
Accrued investment income	0	3
Reinsurance recoverable	0	21
Other assets	0	14
Assets held for sale	0	267
Fair value less closing costs impairment	0	(140)
Total assets held for sale	0	127
Liabilities
Liability for policy and contract claims	0	56
Unearned premiums	0	58
Other liabilities	0	12
Deferred tax liability	0	1
Liabilities held for sale	$ 0	$ 127