Derivative Financial Instruments - Offsetting Assets and Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Offsetting Assets and Liabilities [Line Items]
Asset Fair Value	$ 808	$ 316
Liability Fair Value	948	402
Counterparty netting, Assets	(698)	(290)
Counterparty netting, Liabilities	(698)	(290)
Cash collateral netting, Assets	(102)	(25)
Cash collateral netting, Liabilities	(249)	(100)
Securities collateral netting, Assets	(4)	0
Securities collateral netting, Liabilities	0	(5)
Net receivables/payables, Assets	4	1
Net receivables/payables, Liabilities	1	7
Equity contracts
Offsetting Assets and Liabilities [Line Items]
Notional Amount	282	293
Asset Fair Value	7	9
Liability Fair Value	4	7
Foreign exchange contracts
Offsetting Assets and Liabilities [Line Items]
Notional Amount	926	863
Asset Fair Value	67	12
Liability Fair Value	2	22
Interest rate contracts
Offsetting Assets and Liabilities [Line Items]
Notional Amount	22,107	23,634
Asset Fair Value	734	295
Liability Fair Value	940	371
Credit contracts
Offsetting Assets and Liabilities [Line Items]
Notional Amount	239	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	258	304
Liability Fair Value	69	77
Counterparty netting, Assets	(67)	(76)
Counterparty netting, Liabilities	(67)	(76)
Cash collateral netting, Assets	(161)	(206)
Cash collateral netting, Liabilities	(2)	0
Securities collateral netting, Assets	(14)	(17)
Securities collateral netting, Liabilities	0	0
Net receivables/payables, Assets	16	5
Net receivables/payables, Liabilities	0	1
Discontinued Operations, Held-for-sale \| Equity contracts
Offsetting Assets and Liabilities [Line Items]
Notional Amount	1,850	1,753
Asset Fair Value	207	254
Liability Fair Value	18	20
Discontinued Operations, Held-for-sale \| Foreign exchange contracts
Offsetting Assets and Liabilities [Line Items]
Notional Amount	66	37
Asset Fair Value	4	1
Liability Fair Value	0	1
Discontinued Operations, Held-for-sale \| Interest rate contracts
Offsetting Assets and Liabilities [Line Items]
Notional Amount	2,218	2,228
Asset Fair Value	47	49
Liability Fair Value	51	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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Fair value, after offset of derivative liability, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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

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