Changes in and Reclassifications From Accumulated Other Comprehensive Income (Loss) - Reclassification from AOCI (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net realized gains (losses)	$ 509	$ (14)	$ 395
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	2,896	2,120	2,560
Income tax expense	531	383	475
Net investment income	2,313	1,846	1,951
Interest Expense	234	236	259
Net income	2,365	1,737	2,085
Amount Reclassified from AOCI
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net income	158	109	111
Net Unrealized Gain on Fixed Maturities | Amount Reclassified from AOCI
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net realized gains (losses)	234	171	174
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	234	171	174
Income tax expense	49	36	37
Net income	185	135	137
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Amount Reclassified from AOCI
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	36	26	10
Income tax expense	8	5	2
Net income	28	21	8
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Amount Reclassified from AOCI | Interest rate swaps
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net realized gains (losses)	0	0	2
Net investment income	41	29	4
Interest Expense	(10)	(7)	1
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Amount Reclassified from AOCI | Foreign currency swaps
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net realized gains (losses)	0	(1)	0
Net investment income	5	5	3
Amortization of prior service credit | Amount Reclassified from AOCI
Accumulated Other Comprehensive Income (Loss) [Line Items]
Insurance operating costs and other expenses	7	7	7
Amortization of actuarial loss | Amount Reclassified from AOCI
Accumulated Other Comprehensive Income (Loss) [Line Items]
Insurance operating costs and other expenses	(77)	(67)	(50)
Pension and Other Postretirement Plan Adjustments | Amount Reclassified from AOCI
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	(70)	(60)	(43)
Income tax expense	(15)	(13)	(9)
Net income	$ (55)	$ (47)	$ (34)