Market Risk Benefits (Balances and Changes of Market Risk Benefits) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024	Dec. 31, 2023
Market Risk Benefit [Line Items]
Market Risk Benefit, after Increase (Decrease) from Instrument-Specific Credit Risk	$ 216	$ 202
Market Risk Benefit, Net Amount at Risk	233		$ 223
Insurance, Other | Americas [Member] | Other Segments
Market Risk Benefit [Line Items]
Market Risk Benefit, after Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change	216	202	206	$ 249
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change	221	210	$ 209	$ 253
Market Risk Benefit, Interest Expense	4	6
Market Risk Benefit, Attributed Fee Collected	12	13
Market Risk Benefit, Benefit Payment	0	0
Market Risk Benefit, Increase (Decrease) from Interest Rate Change	10	(34)
Market Risk Benefit, Increase (Decrease) from Equity Market Change	(16)	(26)
Market Risk Benefit, Increase (Decrease) from Volatility	1	0
Market Risk Benefit, Increase (Decrease) from Other Assumption	(8)	(9)
Market Risk Benefit, Increase (Decrease) from Actual Policyholder Behavior Different from Expected	9	7
AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, before Tax	(5)	(8)
Market Risk Benefit, after Increase (Decrease) from Instrument-Specific Credit Risk	216	202
Market Risk Benefit, Reinsurance Recoverable, after Allowance	0	0
Market Risk Benefit, Net Amount at Risk	$ 1,278	$ 1,302
Net Amount at Risk by Product and Guarantee, Weighted Average Attained Age	72 years	71 years