Accounting Changes and Error Corrections (Comp Income) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 253	$ 197	$ 521
Foreign currency translation adjustments	22	22
Net unrealized investment gains (losses)	1,103	(3,790)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax	5	0
Other Comprehensive Income (Loss), Net of Tax	410	(358)	(1,371)	$ 409
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	663	(161)
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	1	0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	662	(161)
OCI, Liability for Future Policy Benefit, Gain (Loss), after Reclassification Adjustment and Tax, Parent	(721)	3,414
OCI, Market Risk Benefit, Instrument-Specific Credit Risk, Gain (Loss), after Adjustments and Tax, Parent	$ 1	$ (4)
Accounting Standards Update 2018-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest			521	1,170
Foreign currency translation adjustments			(102)	56
Net unrealized investment gains (losses)			(9,276)	(1,833)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax			23	22
Other Comprehensive Income (Loss), Net of Tax			(1,371)	409
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest			(850)	1,579
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest			4	0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent			(854)	1,579
OCI, Liability for Future Policy Benefit, Gain (Loss), after Reclassification Adjustment and Tax, Parent			7,964	2,207
OCI, Market Risk Benefit, Instrument-Specific Credit Risk, Gain (Loss), after Adjustments and Tax, Parent			20	(43)
Accounting Standards Update 2018-12 | Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest			627	617
Foreign currency translation adjustments			(162)	60
Net unrealized investment gains (losses)			(9,108)	(1,799)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax			23	22
Other Comprehensive Income (Loss), Net of Tax			(9,247)	(1,717)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest			(8,620)	(1,100)
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest			4	0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent			(8,624)	(1,100)
OCI, Liability for Future Policy Benefit, Gain (Loss), after Reclassification Adjustment and Tax, Parent			0	0
OCI, Market Risk Benefit, Instrument-Specific Credit Risk, Gain (Loss), after Adjustments and Tax, Parent			0	0
Accounting Standards Update 2018-12 | Revision of Prior Period, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest			(106)	553
Foreign currency translation adjustments			60	(4)
Net unrealized investment gains (losses)			(168)	(34)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax			0	0
Other Comprehensive Income (Loss), Net of Tax			7,876	2,126
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest			7,770	2,679
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest			0	0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent			7,770	2,679
OCI, Liability for Future Policy Benefit, Gain (Loss), after Reclassification Adjustment and Tax, Parent			7,964	2,207
OCI, Market Risk Benefit, Instrument-Specific Credit Risk, Gain (Loss), after Adjustments and Tax, Parent			$ 20	$ (43)