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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, 2017
USD ($)
Estimated future amortization expense allocated to other expenses for VOBA [Abstract]  
VOBA 2018 $ 293
VOBA 2019 272
VOBA 2020 248
VOBA 2021 222
VOBA 2022 208
Value of Distribution Agreements and Customer Relationships Acquired [Abstract]  
VODA and VOCRA 2018 47
VODA and VOCRA 2019 43
VODA and VOCRA 2020 40
VODA and VOCRA 2021 36
VODA and VOCRA 2022 33
Negative Value of Business Acquired [Abstract]  
Negative VOBA 2018 (60)
Negative VOBA 2019 (40)
Negative VOBA 2020 (41)
Negative VOBA 2021 (40)
Negative VOBA 2022 $ (38)