Components Net Deferred Income Tax Liability (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Income Taxes [Abstract]
Foreign tax credit carryforwards	$ 320	$ 265
Net operating loss carryforwards	129	297
State income taxes	336	326
Insurance reserves	686	754
Accrued commission and general expenses	142	116
Net unrealized losses on derivatives	0	10
Investments	48	5
Other	51	25
Gross deferred income tax assets	1,712	1,798
Valuation allowance	(347)	(334)
Total deferred income tax assets	1,365	1,464
Net unrealized gains on investment securities	396	153
Net unrealized gains on derivatives	71	0
DAC	275	344
PVFP and other intangibles	21	52
Insurance reserves transition adjustment	148	149
Other	29	30
Total deferred income tax liabilities	940	728
Net deferred income tax asset	$ 425	$ 736