Related Party Transactions (Effects of Affiliated Reinsurance on Balance Sheets) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Effects of Reinsurance [Line Items]
Premiums, reinsurance and other receivables (net of allowance for credit losses)	$ 19,874	$ 19,389
Future policy benefits	31,870	32,149
Market risk benefit liabilities	8,985	10,344
Other liabilities	8,359	7,772
Affiliated Entity | Assumed
Effects of Reinsurance [Line Items]
Premiums, reinsurance and other receivables (net of allowance for credit losses)	30	28
Future policy benefits	47	47
Market risk benefit liabilities	294	367
Other policy-related balances	11	13
Other liabilities	$ (7)	$ (4)