Derivative Financial Instruments - Offsetting Assets and Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Offsetting Assets and Liabilities [Line Items]
Asset Fair Value	$ 873	$ 316
Liability Fair Value	1,067	402
Counterparty netting, Assets	(715)	(290)
Counterparty netting, Liabilities	(715)	(290)
Cash collateral netting, Assets	(151)	(25)
Cash collateral netting, Liabilities	(351)	(100)
Securities collateral netting, Assets	(5)	0
Securities collateral netting, Liabilities	0	(5)
Net receivables/payables, Assets	2	1
Net receivables/payables, Liabilities	1	7
Equity contracts
Offsetting Assets and Liabilities [Line Items]
Notional Amount	290	293
Asset Fair Value	3	9
Liability Fair Value	28	7
Foreign exchange contracts
Offsetting Assets and Liabilities [Line Items]
Notional Amount	923	863
Asset Fair Value	88	12
Liability Fair Value	0	22
Interest rate contracts
Offsetting Assets and Liabilities [Line Items]
Notional Amount	25,368	23,634
Asset Fair Value	782	295
Liability Fair Value	1,037	371
Credit contracts
Offsetting Assets and Liabilities [Line Items]
Notional Amount	235	237
Asset Fair Value	0	0
Liability Fair Value	2	2
Discontinued Operations, Held-for-sale
Offsetting Assets and Liabilities [Line Items]
Asset Fair Value	148	304
Liability Fair Value	58	77
Counterparty netting, Assets	(56)	(76)
Counterparty netting, Liabilities	(56)	(76)
Cash collateral netting, Assets	(73)	(206)
Cash collateral netting, Liabilities	(2)	0
Securities collateral netting, Assets	(9)	(17)
Securities collateral netting, Liabilities	0	0
Net receivables/payables, Assets	10	5
Net receivables/payables, Liabilities	0	1
Discontinued Operations, Held-for-sale \| Equity contracts
Offsetting Assets and Liabilities [Line Items]
Notional Amount	1,821	1,753
Asset Fair Value	93	254
Liability Fair Value	3	20
Discontinued Operations, Held-for-sale \| Foreign exchange contracts
Offsetting Assets and Liabilities [Line Items]
Notional Amount	50	37
Asset Fair Value	5	1
Liability Fair Value	0	1
Discontinued Operations, Held-for-sale \| Interest rate contracts
Offsetting Assets and Liabilities [Line Items]
Notional Amount	2,213	2,228
Asset Fair Value	50	49
Liability Fair Value	55	56
Discontinued Operations, Held-for-sale \| Credit contracts
Offsetting Assets and Liabilities [Line Items]
Notional Amount	0	0
Asset Fair Value	0	0
Liability Fair Value	$ 0	$ 0

Amount of obligation to return cash collateral under master netting arrangements offset against derivative assets.

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