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Investments (Realized Investment Gains Losses Net) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Gain (Loss) on Securities [Line Items]      
Realized investment gains (losses), net [1] $ (3,615) [2] $ (4,507) [3],[4] $ 2,115 [3],[4]
Fixed maturities      
Gain (Loss) on Securities [Line Items]      
Realized investment gains (losses), net (1,311) (1,487) 1,939
Commercial mortgage and other loans      
Gain (Loss) on Securities [Line Items]      
Realized investment gains (losses), net (255) (133) 173
Investment real estate      
Gain (Loss) on Securities [Line Items]      
Realized investment gains (losses), net 45 83 108
LPs/LLCs      
Gain (Loss) on Securities [Line Items]      
Realized investment gains (losses), net 72 (120) (14)
Derivatives      
Gain (Loss) on Securities [Line Items]      
Realized investment gains (losses), net (2,234) (2,851) (113)
Other invested assets      
Gain (Loss) on Securities [Line Items]      
Realized investment gains (losses), net $ 68 $ 1 $ 22
[1] See Note 24 for additional information regarding related party transactions.
[2] See Note 24 for additional information regarding related party transactions.
[3] Prior period amounts adjusted for the implementation of ASU 2018-12: Targeted Improvements to the Accounting for Long-Duration Contracts.
[4] Prior period amounts adjusted for the adoption of ASU 2018-12: Targeted Improvements to the Accounting for Long-Duration Contracts.