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Segment Information (Reconciliation of DAC VOBA Amortization From Segments to Consolidated) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Amortization of DAC and VOBA, Net of Interest      
Amortization of DAC and VOBA, net of interest $ 1,241 $ 976 $ 1,271
Annuities Segment [Member]      
Amortization of DAC and VOBA, Net of Interest      
Amortization of DAC and VOBA, net of interest 410 401 383
Retirement Plan Services Segment [Member]      
Amortization of DAC and VOBA, Net of Interest      
Amortization of DAC and VOBA, net of interest 28 27 28
Life Insurance Segment [Member]      
Amortization of DAC and VOBA, Net of Interest      
Amortization of DAC and VOBA, net of interest 711 469 734
Group Protection Segment [Member]      
Amortization of DAC and VOBA, Net of Interest      
Amortization of DAC and VOBA, net of interest $ 92 $ 79 $ 126