Insurance Liabilities - Balances and Changes in Liability for Future Policy Benefits (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Present value of expected net premiums
Balance, beginning of year	$ 1,702	$ 1,929
Effect of changes in discount rate assumptions (AOCI)	339	262
Beginning balance at original discount rate	2,041	2,191
Effect of changes in cash flow assumptions		12	$ (2)
Effect of actual variances from expected experience		(12)	(16)
Adjusted beginning of year balance	2,041	2,173
Issuances	88	122
Interest accrual	39	43
Net premium collected	(254)	(283)
Foreign exchange impact	(165)	(14)
Ending balance at original discount rate	1,749	2,041
Effect of changes in discount rate assumptions (AOCI)	(203)	(339)
Balance, end of year	1,546	1,702
Present value of expected future policy benefits
Balance, beginning of year	2,149	2,380
Effect of changes in discount rate assumptions (AOCI)	441	362
Beginning balance at original discount rate	2,590	2,742
Effect of changes in cash flow assumptions		3	(13)
Effect of actual variances from expected experience		(12)	$ (18)
Adjusted beginning of year balance	2,581	2,711
Issuances	93	130
Interest accrual	48	52
Benefit payments	(262)	(276)
Foreign exchange impact	(211)	(27)
Ending balance at original discount rate	2,249	2,590
Effect of changes in discount rate assumptions (AOCI)	(273)	(441)
Balance, end of year	1,976	2,149
Net liability for future policy benefits, end of year	430	447
Deferred profit liability	1	1
Other reconciling items	886	1,019
Future policy benefits	1,317	1,467
Less: Reinsurance recoverable	(726)	(823)
Net liability for future policy benefits after reinsurance recoverable	$ 591	$ 644
Weighted average liability duration of the liability for future policy benefits (in years)	9 years 1 month 6 days	9 years 3 months 18 days
Long-Duration Insurance
Present value of expected future policy benefits
Other reconciling items	$ 691	$ 785
Ceded percentage	1	1