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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, 2018
USD ($)
Estimated future amortization expense allocated to other expenses for VOBA [Abstract]  
VOBA 2019 $ 267
VOBA 2020 247
VOBA 2021 223
VOBA 2022 209
VOBA 2023 195
Value of Distribution Agreements and Customer Relationships Acquired [Abstract]  
VODA and VOCRA 2019 42
VODA and VOCRA 2020 38
VODA and VOCRA 2021 35
VODA and VOCRA 2022 32
VODA and VOCRA 2023 29
Negative Value of Business Acquired [Abstract]  
Negative VOBA 2019 (41)
Negative VOBA 2020 (41)
Negative VOBA 2021 (39)
Negative VOBA 2022 (37)
Negative VOBA 2023 $ (36)