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Derivatives - Cash Flow Hedges (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Realized Investment Gains (Losses) $ (193) $ 21
Net Investment Income 238 312
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net 1  
Loss on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring 0 0
Designated as Hedging Instrument | Cash Flow Hedging    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Gain (Loss) Recognized in OCI on Derivative (Effective Portion) 0 (16)
Reclassification out of Accumulated Other Comprehensive Income | Net realized capital gain/(loss) | Designated as Hedging Instrument | Cash Flow Hedging    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 0 2
Reclassification out of Accumulated Other Comprehensive Income | Investment Income [Member] | Designated as Hedging Instrument | Cash Flow Hedging    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 0 5
Interest rate swaps | Designated as Hedging Instrument | Cash Flow Hedging    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Gain (Loss) Recognized in OCI on Derivative (Effective Portion) 0 (16)
Interest rate swaps | Reclassification out of Accumulated Other Comprehensive Income | Investment Income [Member] | Cash Flow Hedging    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 0  
Interest rate swaps | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent | Reclassification out of Accumulated Other Comprehensive Income    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Net Investment Income   5
Interest rate swaps | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent | Reclassification out of Accumulated Other Comprehensive Income | Net realized capital gain/(loss) | Designated as Hedging Instrument | Cash Flow Hedging    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 0 0
Interest rate swaps | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent | Reclassification out of Accumulated Other Comprehensive Income | Investment Income [Member] | Designated as Hedging Instrument | Cash Flow Hedging    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net   5
Currency Swap [Member] | Designated as Hedging Instrument | Cash Flow Hedging    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Gain (Loss) Recognized in OCI on Derivative (Effective Portion) 0  
Currency Swap [Member] | Reclassification out of Accumulated Other Comprehensive Income | Net realized capital gain/(loss) | Cash Flow Hedging    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 0  
Currency Swap [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent | Net realized capital gain/(loss) | Cash Flow Hedging    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 0 2
Currency Swap [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent | Investment Income [Member] | Cash Flow Hedging    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net $ 0 0
Currency Swap [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent | Reclassification out of Accumulated Other Comprehensive Income | Net realized capital gain/(loss) | Cash Flow Hedging    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net   $ 2