Derivative Financial Instruments - Offsetting Assets and Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Offsetting Assets and liabilities [Line Items]
Asset Fair Value	$ 178	$ 224
Liability Fair Value	250	285
Counterparty netting, Assets	(155)	(217)
Counterparty netting, Liabilities	(155)	(217)
Cash collateral netting, Assets	(19)	(6)
Cash collateral netting, Liabilities	(94)	(58)
Securities collateral netting, Assets	0	0
Securities collateral netting, Liabilities	0	(5)
Net receivables	4	1
Net payables	1	5
Equity contract
Offsetting Assets and liabilities [Line Items]
Notional Amount	50	63
Asset Fair Value	3	4
Liability Fair Value	3	3
Foreign exchange contracts
Offsetting Assets and liabilities [Line Items]
Notional Amount	682	706
Asset Fair Value	24	10
Liability Fair Value	8	19
Interest rate contracts
Offsetting Assets and liabilities [Line Items]
Notional Amount	12,527	17,621
Asset Fair Value	151	210
Liability Fair Value	237	261
Credit contracts
Offsetting Assets and liabilities [Line Items]
Notional Amount	191	182
Asset Fair Value	0	0
Liability Fair Value	$ 2	$ 2

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[Line Items] for Offsetting Assets and Liabilities [Table]

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