Related Party Transactions (Effects of Affiliated Reinsurance on Balance Sheets) (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Effects of Reinsurance [Line Items]
Premiums, reinsurance and other receivables (net of allowance for credit losses)	$ 20,901	$ 20,809
Future policy benefits	31,442	31,085
Market risk benefit liabilities	9,182	8,346
Other liabilities	8,592	8,460
Affiliated Entity | Assumed
Effects of Reinsurance [Line Items]
Premiums, reinsurance and other receivables (net of allowance for credit losses)	31	32
Future policy benefits	53	51
Market risk benefit liabilities	269	235
Other policy-related balances	11	14
Other liabilities	$ (15)	$ (16)