Equity (Balance of and Changes in Each Component of AOCI) (Details) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022
Balance, Beginning of Period		$ (1,871)	$ (500)
Other Comprehensive Income (Loss), before Reclassifications, before Tax		522	(1,959)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax		141	204
Other Comprehensive Income (Loss), Tax		125	(277)
Balance, End of Period		(1,333)	(1,978)
Accumulated Translation Adjustment [Member]
Balance, Beginning of Period		(116)	(13)
Other Comprehensive Income (Loss), before Reclassifications, before Tax		116	(78)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax		0	0
Other Comprehensive Income (Loss), Tax		(33)	(56)
Balance, End of Period		(33)	(147)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Balance, Beginning of Period	[1]	(5,496)	3,779
Other Comprehensive Income (Loss), before Reclassifications, before Tax	[1]	(1,652)	(12,398)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	[1]	140	202
Other Comprehensive Income (Loss), Tax	[1]	(349)	(2,629)
Balance, End of Period	[1]	(6,659)	(5,788)
Accumulated Defined Benefit Plans Adjustment [Member]
Balance, Beginning of Period		(27)	(50)
Other Comprehensive Income (Loss), before Reclassifications, before Tax		16	(3)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax		1	2
Other Comprehensive Income (Loss), Tax		(4)	0
Balance, End of Period		(14)	(51)
AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, Parent
Balance, Beginning of Period		13	(7)
Other Comprehensive Income (Loss), before Reclassifications, before Tax		(8)	33
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax		0	0
Other Comprehensive Income (Loss), Tax		2	(7)
Balance, End of Period		7	19
AOCI, Liability for Future Policy Benefit, Parent
Balance, Beginning of Period		3,755	(4,209)
Other Comprehensive Income (Loss), before Reclassifications, before Tax		2,050	10,487
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax		0	0
Other Comprehensive Income (Loss), Tax		439	2,289
Balance, End of Period		$ 5,366	$ 3,989

[1] Includes cash flow hedges of $(351) and $(205) as of September 30, 2023 and December 31, 2022, respectively, and $(230) and $(22) as of September 30, 2022 and December 31, 2021, respectively. See Note 12 – “Derivative Instruments” for additional information on cash flow hedges.