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Derivatives - Cash Flow Hedges (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Net realized gains (losses) | $ 509 | $ (14) | $ 395
Net investment income | 2,313 | 1,846 | 1,951
Interest Expense | 234 | 236 | 259
Interest rate swaps | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Net realized gains (losses) | 0 | 0 | 2
Net investment income | 41 | 29 | 4
Interest Expense | (10) | (7) | 1
Foreign currency swaps | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Net realized gains (losses) | 0 | (1) | 0
Net investment income | 5 | 5 | 3
Designated as Hedging Instrument | Cash Flow Hedging |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax | 28 | 30 | 26
Designated as Hedging Instrument | Cash Flow Hedging | Reclassification out of Accumulated Other Comprehensive Income | Gain (Loss) on Investments [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Gain Reclassified from AOCI into Income | 0 | (1) | 2
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 | 46 | 34 | 7
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 | (10) | (7) | 1
Designated as Hedging Instrument | Cash Flow Hedging | Interest rate swaps |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax | 4 | 38 | 18
Designated as Hedging Instrument | Cash Flow Hedging | Interest rate swaps | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Gain (Loss) on Investments [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Gain Reclassified from AOCI into Income | 0 | 0 | 2
Designated as Hedging Instrument | Cash Flow Hedging | Interest rate swaps | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Foreign currency swaps |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Gain Reclassified from AOCI into Income | 41 | 29 | 4
Designated as Hedging Instrument | Cash Flow Hedging | Interest rate swaps | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Interest Expense [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Gain Reclassified from AOCI into Income | (10) | (7) | 1
Designated as Hedging Instrument | Cash Flow Hedging | Foreign currency swaps |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax | 24 | (8) | 8
Designated as Hedging Instrument | Cash Flow Hedging | Foreign currency swaps | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Gain (Loss) on Investments [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Gain Reclassified from AOCI into Income | 0 | (1) | 0
Designated as Hedging Instrument | Cash Flow Hedging | Foreign currency swaps | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Foreign currency swaps |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Gain Reclassified from AOCI into Income | 5 | 5 | 3
Designated as Hedging Instrument | Cash Flow Hedging | Foreign currency swaps | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Net, Cash Flow Hedge, 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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