Equity (Components of Other Comprehensive Income) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
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		$ (185)	$ 224	$ (131)
Other Comprehensive Income (Loss), Foreign Currency Translation Gain (Loss) Arising During Period, Tax		(5)	(26)	(22)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax		(190)	198	(153)
Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Foreign Currency Swap, Before Reclassification and Tax		129	(18)	64
Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Foreign Currency Swap Tax		(27)	4	(13)
Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Foreign Currency Swap Net Of Tax		102	(14)	51
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax		(56)	206	(67)
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax		(32)	(22)	(35)
Foreign currency translation adjustments		(88)	184	(102)
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, before Tax	[1]	(1,667)	2,050	(12,036)
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax	[1]	326	(401)	2,582
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax	[1]	(1,341)	1,649	(9,454)
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, before Tax	[1]	(633)	(228)	(218)
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, Tax	[1]	150	48	40
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, Net of Tax	[1]	(483)	(180)	(178)
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Reclassification Adjustments and Tax	[1]	(1,034)	2,278	(11,818)
Other Comprehensive Income (Loss), Available-for-sale Securities, before Reclassification Adjustments, Tax	[1]	(176)	449	2,542
Net unrealized investment gains (losses)	[1]	(858)	1,829	(9,276)
OCI, Liability for Future Policy Benefit, Gain (Loss), after Reclassification Adjustment, Tax		(586)	161	(2,224)
OCI, Liability for Future Policy Benefit, Gain (Loss), before Reclassification Adjustment and Tax		2,742	(660)	10,188
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax		(2)	(1)	(3)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, Tax		0	(1)	1
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax		(2)	0	(2)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax		13	(3)	33
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax		(2)	1	(8)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax		11	(2)	25
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax		11	(4)	30
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax		(2)	2	(7)
Defined benefit pension and postretirement plan adjustments		9	(2)	23
Other Comprehensive Income (Loss), before Tax		1,662	1,807	(1,642)
Other Comprehensive Income (Loss), Tax		(444)	(305)	271
Other Comprehensive Income (Loss), Net of Tax		1,218	1,502	(1,371)
Effect of updating discount rates on future policy benefits		2,156	(499)	7,964
OCI, Market Risk Benefit, Instrument-Specific Credit Risk, Gain (Loss), before Adjustments and Tax		(1)	(13)	25
Change in instrument-specific credit risk for market risk benefits		(1)	(10)	20
OCI, Market Risk Benefit, Instrument-Specific Credit Risk, Gain (Loss), after Adjustments, Tax		$ 0	$ 3	$ (5)

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