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Derivative Instruments - Derivatives - Cash Flow Hedges (Details) - Cash Flow Hedging - Designated as Hedging Instrument - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Gain (Loss) Recognized in OCI on Derivative (Effective Portion) $ 6 $ 13 $ (15) $ 10
Reclassification out of Accumulated Other Comprehensive Income        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Gain (Loss) Reclassified from AOCI into Income (Effective Portion) 9 11 18 24
Interest rate swaps        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Gain (Loss) Recognized in OCI on Derivative (Effective Portion) (2) 17 (16) 14
Interest rate swaps | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent | Net realized capital gains        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Gain (Loss) Reclassified from AOCI into Income (Effective Portion) 0 1 1 5
Interest rate swaps | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent | Net investment income        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Gain (Loss) Reclassified from AOCI into Income (Effective Portion) 9 10 17 19
Foreign currency swaps        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Gain (Loss) Recognized in OCI on Derivative (Effective Portion) $ 8 $ (4) $ 1 $ (4)