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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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