Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2026	Mar. 31, 2026	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2026	Jun. 30, 2025
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Balance at beginning of period	$ 77,637	$ 75,382	$ 77,110	$ 75,730	$ 75,382	$ 75,730
Other comprehensive income (loss)	(13)	(205)	213	179	(218)	392
Balance at end of period	79,899	77,637	77,551	77,110	79,899	77,551
Gains expected to be reclassified	16				16
AOCI Including Portion Attributable to Noncontrolling Interest
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Balance at beginning of period	201	406	59	(120)	406	(120)
Balance at end of period	188	201	272	59	188	272
Net unrealized investment gains (losses):
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Balance at beginning of period	(38)	206	(183)	(399)	206	(399)
Other comprehensive income (loss) before reclassifications, net of tax	(17)		136		(271)	323
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	8		51		18	80
Other comprehensive income (loss)	(9)		187		(253)	403
Balance at end of period	(47)	(38)	4	(183)	(47)	4
Other comprehensive income (loss) before reclassifications, pretax	(24)		136		(353)	324
Amounts reclassified from accumulated other comprehensive income (loss), pretax	10		55		23	87
Change in discount rate on long-duration insurance reserves:
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Balance at beginning of period	258	215	232	265	215	265
Other comprehensive income (loss) before reclassifications, net of tax	1		23		44	(10)
Other comprehensive income (loss)	1		23		44	(10)
Balance at end of period	259	258	255	232	259	255
Other comprehensive income (loss) before reclassifications, pretax	2		29		56	(12)
Foreign currency translation adjustments:
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Balance at beginning of period	7	7	(4)	(4)	7	(4)
Other comprehensive income (loss) before reclassifications, net of tax	(1)		4		(1)	4
Other comprehensive income (loss)	(1)		4		(1)	4
Balance at end of period	6	7	0	(4)	6	0
Net cash flow hedges:
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Balance at beginning of period	212	216	225	229	216	229
Other comprehensive income (loss) before reclassifications, net of tax	0		3		0	3
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	(4)		(4)		(8)	(8)
Other comprehensive income (loss)	(4)		(1)		(8)	(5)
Balance at end of period	208	212	224	225	208	224
Other comprehensive income (loss) before reclassifications, pretax	0		5		0	5
Amounts reclassified from accumulated other comprehensive income (loss), pretax	(6)		(6)		(11)	(12)
Pension and other postretirement benefits:
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Balance at beginning of period	(238)	(238)	(211)	(211)	(238)	(211)
Other comprehensive income (loss)	0		0		0	0
Balance at end of period	$ (238)	$ (238)	$ (211)	$ (211)	$ (238)	$ (211)