Accumulated Other Comprehensive Income Loss - Reclassifications from AOCI (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest, Total	$ 431	$ 583	$ 1,526	$ 1,996
Net Investment Income	487	650	1,537	1,740
Interest Expense	50	58	163	172
Income tax expense	92	101	300	360
Net income	339	482	1,226	1,636
Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net income	(65)	37	(195)	67
Reclassification out of Accumulated Other Comprehensive Income | Net Unrealized Gain on Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Marketable Securities, Gain (Loss), Excluding Other-than-temporary Impairment Loss	(70)	55	(222)	112
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest, Total	(70)	55	(222)	112
Income tax expense	(15)	12	(47)	24
Net income	(55)	43	(175)	88
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest, Total	2	9	16	26
Income tax expense	0	2	0	5
Net income	2	7	16	21
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Interest rate swaps
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net Investment Income	(1)	11	13	31
Interest Expense	0	(3)	(4)	(8)
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Currency Swap [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net Investment Income	3	1	7	3
Reclassification out of Accumulated Other Comprehensive Income | Amortization of prior service credit
Accumulated Other Comprehensive Income (Loss) [Line Items]
Insurance operating costs and other expenses	2	2	5	5
Reclassification out of Accumulated Other Comprehensive Income | Amortization of actuarial loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Insurance operating costs and other expenses	(17)	(19)	(51)	(58)
Reclassification out of Accumulated Other Comprehensive Income | Pension and Other Postretirement Plan Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest, Total	(15)	(17)	(46)	(53)
Income tax expense	(3)	(4)	(10)	(11)
Net income	$ (12)	$ (13)	$ (36)	$ (42)