Income Taxes - Significant Components of Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Deferred income tax assets and liabilities
Statutory rate (as a percent)	21.00%	21.00%	21.00%
Deferred income tax assets
Liabilities for policyholder account balances, future policy benefits and claims	$ 1,996	$ 1,618
Deferred compensation	586	493
Right of use lease liability	73	60
Postretirement benefits		65
Other	106	51
Gross deferred income tax assets	2,761	2,287
Less: valuation allowance	32	15
Total deferred income tax assets	2,729	2,272
Deferred income tax liabilities
Investment related	565	253
Deferred acquisition costs	481	435
Intangible assets	209	124
Net unrealized gains on Available-for-Sale securities	113	295
Depreciation expense	89	99
Goodwill	77	70
Right of use lease asset	62	54
Deferred sales inducement costs		44
Other	45	18
Gross deferred income tax liabilities	1,641	1,392
Net deferred income tax assets	$ 1,088	$ 880