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Derivatives - Cash Flow Hedges (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net realized capital gains (losses)	$ (14)	$ 395	$ (112)
Net investment income	1,846	1,951	1,780
Interest Expense	236	259	298
Interest rate swaps | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net investment income	29	4	30
Interest Expense	(7)	1	0
Foreign currency swaps | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net investment income	5	3	0
Designated as Hedging Instrument | Cash Flow Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (Loss) Recognized in OCI on Derivative	30	26	12
Designated as Hedging Instrument | Cash Flow Hedging | Reclassification out of Accumulated Other Comprehensive Income | Interest rate swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain Reclassified from AOCI into Income	(1)	2	6
Designated as Hedging Instrument | Cash Flow Hedging | Reclassification out of Accumulated Other Comprehensive Income | Foreign currency swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain Reclassified from AOCI into Income	34	7	30
Designated as Hedging Instrument | Cash Flow Hedging | Reclassification out of Accumulated Other Comprehensive Income | Interest Expense [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain Reclassified from AOCI into Income	(7)	1	0
Designated as Hedging Instrument | Cash Flow Hedging | Interest rate swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (Loss) Recognized in OCI on Derivative	38	18	5
Designated as Hedging Instrument | Cash Flow Hedging | Interest rate swaps | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent | Interest rate swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain Reclassified from AOCI into Income	0	2	6
Designated as Hedging Instrument | Cash Flow Hedging | Interest rate swaps | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent | Foreign currency swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain Reclassified from AOCI into Income	29	4	30
Designated as Hedging Instrument | Cash Flow Hedging | Interest rate swaps | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent | Interest Expense [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain Reclassified from AOCI into Income	(7)	1	0
Designated as Hedging Instrument | Cash Flow Hedging | Foreign currency swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (Loss) Recognized in OCI on Derivative	(8)	8	7
Designated as Hedging Instrument | Cash Flow Hedging | Foreign currency swaps | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent | Interest rate swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain Reclassified from AOCI into Income	(1)	0	0
Designated as Hedging Instrument | Cash Flow Hedging | Foreign currency swaps | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent | Foreign currency swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain Reclassified from AOCI into Income	5	3	0
Designated as Hedging Instrument | Cash Flow Hedging | Foreign currency swaps | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent | Interest Expense [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain Reclassified from AOCI into Income	$ 0	$ 0	$ 0

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