Derivatives - Cash Flow Hedges (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net Investment Income	$ 487	$ 650	$ 1,537	$ 1,740
Interest Expense	50	58	163	172
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 Investment Income	(1)	11	13	31
Interest Expense	0	(3)	(4)	(8)
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 Investment Income	3	1	7	3
Cash Flow Hedging | Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	51	10	95	27
Cash Flow Hedging | Designated as Hedging Instrument | Reclassification out of Accumulated Other Comprehensive Income | Net investment income
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	2	12	20	34
Cash Flow Hedging | Designated as Hedging Instrument | Reclassification out of Accumulated Other Comprehensive Income | Interest expense
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	0	(3)	(4)	(8)
Cash Flow Hedging | Designated as Hedging Instrument | Interest rate swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	8	2	2	8
Cash Flow Hedging | Designated as Hedging Instrument | Interest rate swaps | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Net investment income
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	(1)	11	13	31
Cash Flow Hedging | Designated as Hedging Instrument | Interest rate swaps | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Interest expense
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	0	(3)	(4)	(8)
Cash Flow Hedging | Designated as Hedging Instrument | Foreign currency swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	43	8	93	19
Cash Flow Hedging | Designated as Hedging Instrument | Foreign currency swaps | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Net investment income
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	3	1	7	3
Cash Flow Hedging | Designated as Hedging Instrument | Foreign currency swaps | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Interest expense
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	$ 0	$ 0	$ 0	$ 0