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Derivatives - Cash Flow Hedges (Details) - USD ($)
3 Months Ended 4 Months Ended 5 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
May 31, 2018
Sep. 30, 2017
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Loss on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring $ 0 $ 0 $ 0 $ 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 (1,000,000) 0 (17,000,000) 3,000,000
Gain (Loss) on Cash Flow Hedge Ineffectiveness, Net 0 0 0 0 0
Reclassification out of Accumulated Other Comprehensive Income | 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 10,000,000 0 6,000,000 28,000,000
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 (3,000,000)   (17,000,000) (3,000,000)
Interest rate swaps | 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        
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 | 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 0 0 (1,000,000)
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 0 7,000,000 0 8,000,000 20,000,000
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 2,000,000     6,000,000
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   0 $ (2,000,000) $ 9,000,000
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   $ 3,000,000 $ 0