Related Party Transactions (Effects of Affiliated Reinsurance on Balance Sheets) (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Effects of Reinsurance [Line Items]
Premiums, reinsurance and other receivables (net of allowance for credit losses)	$ 20,970	$ 20,809
Future policy benefits	31,655	31,085
Market risk benefit liabilities	8,546	8,346
Other liabilities	9,730	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	56	51
Market risk benefit liabilities	230	235
Other policy-related balances	15	14
Other liabilities	$ (20)	$ (16)