Summary of Significant Accounting Policies (Pre-Transition LFPB to Adjusted Opening Balance) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Present value of future net premiums
Effect of change in cash flow assumptions	$ 36	$ 538	$ 176
Reclassification of reserves for policyholders on claim to Future policy benefits
Present value of future net premiums
Effect of change in cash flow assumptions			2,844
De-recognition of shadow reserves
Present value of future net premiums
Effect of change in cash flow assumptions			(3,293)
Re-measurement of LFPB using an upper-medium grade fixed income instrument yield discount rate
Present value of future net premiums
Effect of change in cash flow assumptions			6,255
Other adjustments
Present value of future net premiums
Effect of change in cash flow assumptions			$ 8