Shareholders' Equity - OCI Components (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Pretax
Total other comprehensive income (loss)	$ (70)	$ 342	$ (466)	$ 829
Income Tax Benefit (Expense)
Total other comprehensive income (loss)	(1)	(59)	82	(157)
Net of Tax
Arising during the period	(78)	271	(389)	664
Reclassification to net income	7	12	5	8
Total other comprehensive income (loss), net of tax	(71)	283	(384)	672
Net unrealized gains (losses) on securities
Pretax
Total other comprehensive income (loss)	(15)	250	(504)	732
Income Tax Benefit (Expense)
Total other comprehensive income (loss)	(9)	(58)	98	(166)
Net of Tax
Arising during the period	(31)	180	(411)	558
Reclassification to net income	7	12	5	8
Total other comprehensive income (loss), net of tax	(24)	192	(406)	566
Net unrealized gains (losses) on securities arising during the period
Pretax
Arising during the period	(39)	233	(531)	724
Income Tax Benefit (Expense)
Arising during the period	(4)	(54)	103	(164)
Net of Tax
Arising during the period	(43)	179	(428)	560
Reclassification of net (gains) losses on securities included in net income
Pretax
Reclassification to net income	9	15	6	10
Income Tax Benefit (Expense)
Reclassification to net income	(2)	(3)	(1)	(2)
Net of Tax
Reclassification to net income	7	12	5	8
Impact of benefit reserves and reinsurance recoverables
Pretax
Arising during the period	15	2	21	(2)
Income Tax Benefit (Expense)
Arising during the period	(3)	(1)	(4)	0
Net of Tax
Arising during the period	12	1	17	(2)
Net unrealized gains (losses) on derivatives
Pretax
Arising during the period	0	(1)	0	(11)
Total other comprehensive income (loss)	0	(1)	0	(11)
Income Tax Benefit (Expense)
Arising during the period	0	0	0	2
Total other comprehensive income (loss)	0	0	0	2
Net of Tax
Arising during the period	0	(1)	0	(9)
Reclassification to net income	0	0	0	0
Total other comprehensive income (loss), net of tax	0	(1)	0	(9)
Effect of changes in discount rate assumptions on certain long-duration contracts
Pretax
Total other comprehensive income (loss)	(6)	(15)	77	(53)
Income Tax Benefit (Expense)
Total other comprehensive income (loss)	1	3	(17)	11
Net of Tax
Arising during the period	(5)	(12)	60	(42)
Reclassification to net income	0	0	0	0
Total other comprehensive income (loss), net of tax	(5)	(12)	60	(42)
Effect of changes in instrument-specific credit risk on MRBs
Pretax
Total other comprehensive income (loss)	(38)	1	0	2
Income Tax Benefit (Expense)
Total other comprehensive income (loss)	8	0	0	0
Net of Tax
Arising during the period	(30)	1	0	2
Reclassification to net income	0	0	0	0
Total other comprehensive income (loss), net of tax	(30)	1	0	2
Foreign currency translation
Pretax
Total other comprehensive income (loss)	(11)	107	(39)	159
Income Tax Benefit (Expense)
Total other comprehensive income (loss)	(1)	(4)	1	(4)
Net of Tax
Arising during the period	(12)	103	(38)	155
Reclassification to net income	0	0	0	0
Total other comprehensive income (loss), net of tax	$ (12)	$ 103	$ (38)	$ 155

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