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Deferred Policy Acquisition Costs, Value of Business Acquired and Other Policy-Related Intangibles (Estimated Future Amortization) (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Estimated future amortization expense allocated to other expenses for VOBA [Abstract]  
VOBA 2021 $ 221
VOBA 2022 215
VOBA 2023 205
VOBA 2024 200
VOBA 2025 187
Value of Distribution Agreements and Customer Relationships Acquired [Abstract]  
VODA and VOCRA 2021 94
VODA and VOCRA 2022 88
VODA and VOCRA 2023 85
VODA and VOCRA 2024 82
VODA and VOCRA 2025 81
Negative Value of Business Acquired [Abstract]  
Negative VOBA 2021 (42)
Negative VOBA 2022 (39)
Negative VOBA 2023 (38)
Negative VOBA 2024 (36)
Negative VOBA 2025 $ (35)