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Summary of Significant Accounting Policies (Effects of Adoption ASU 2018-12, Cash Flows) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Net income $ 239 $ (42) $ 190 $ 295 $ 1,205 $ 682 [1] $ 1,184 [1]
Deferred income tax expense (benefit)         2 (89) [1] 43 [1]
Insurance reserves         $ 1,667 2,058 [1] 2,485 [1]
Prior to Adoption              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Net income 248 128 205 313   894 1,202
Deferred income tax expense (benefit)           (34) 47
Insurance reserves           1,791 2,463
Effect of Adoption              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Net income $ (9) $ (170) $ (15) $ (18)   (212) (18)
Deferred income tax expense (benefit)           (55) (4)
Insurance reserves           $ 267 $ 22
[1] As of January 1, 2023, the Company adopted ASU 2018-12, Financial Services-Insurance (Topic 944): Targeted Improvements to the Accounting for Long-Duration Contracts (ASU 2018-12) using the modified retrospective method applied as of the transition date of January 1, 2021. Prior period amounts in the financial statements have been adjusted to reflect application of the new guidance. See Note A to the Consolidated Financial Statements for additional information.