Equity (Components of Other Comprehensive Income) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss), before Reclassification and Tax		$ 224	$ (131)	$ 81
Other Comprehensive Income (Loss), Foreign Currency Translation Gain (Loss) Arising During Period, Tax		(26)	(22)	(23)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax		198	(153)	58
Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Foreign Currency Swap, Before Reclassification and Tax		(18)	64	(2)
Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Foreign Currency Swap Tax		4	(13)	0
Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Foreign Currency Swap Net Of Tax		(14)	51	(2)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax		206	(67)	79
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax		(22)	(35)	(23)
Foreign currency translation adjustments		184	(102)	56
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, before Tax	[1]	2,050	(12,036)	(2,137)
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax	[1]	(401)	2,582	481
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax	[1]	1,649	(9,454)	(1,656)
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, before Tax	[1]	(228)	(218)	226
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, Tax	[1]	48	40	(49)
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, Net of Tax	[1]	(180)	(178)	177
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Reclassification Adjustments and Tax	[1]	2,278	(11,818)	(2,363)
Other Comprehensive Income (Loss), Available-for-sale Securities, before Reclassification Adjustments, Tax	[1]	(449)	2,542	530
Net unrealized investment gains (losses)	[1]	1,829	(9,276)	(1,833)
Other than Temporary Impairment Loss, Investments, Portion in Other Comprehensive Loss, before Tax, Portion Attributable to Parent, Available-for-sale Securities		0	0	0
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, Tax, Portion Attributable to Parent, Available-for-sale Securities		0	0	0
Change in instrument-specific credit risk for market risk benefits		0	0	0
OCI, Liability for Future Policy Benefit, Gain (Loss), after Reclassification Adjustment, Tax		161	(2,224)	(580)
OCI, Liability for Future Policy Benefit, Gain (Loss), before Reclassification Adjustment and Tax		(660)	10,188	2,787
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax		(1)	(3)	2
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, Tax		1	1	0
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax		0	(2)	2
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax		(3)	33	27
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax		1	(8)	(7)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax		(2)	25	20
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax		(4)	30	29
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax		2	(7)	(7)
Defined benefit pension and postretirement plan adjustments		(2)	23	22
Other Comprehensive Income (Loss), before Tax		1,807	(1,642)	478
Other Comprehensive Income (Loss), Tax		(305)	271	(69)
Other Comprehensive Income (Loss), Net of Tax		1,502	(1,371)	409
Effect of updating discount rates on future policy benefits		(499)	7,964	2,207
OCI, Market Risk Benefit, Instrument-Specific Credit Risk, Gain (Loss), before Adjustments and Tax		(13)	25	(54)
Change in instrument-specific credit risk for market risk benefits		(10)	20	(43)
OCI, Market Risk Benefit, Instrument-Specific Credit Risk, Gain (Loss), after Adjustments, Tax		$ 3	$ (5)	$ 11

[1] Includes cash flow hedges. See Note 12 for additional information on cash flow hedges.