Derivative Financial Instruments - Offsetting Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Offsetting Assets and Liabilities [Line Items]
Derivatives, Asset Fair Value	$ 316	$ 195
Derivatives, Liability Fair Value	402	163
Counterparty netting, Assets	(290)	(141)
Counterparty netting, Liabilities	(290)	(141)
Cash collateral netting, Assets	(25)	(49)
Cash collateral netting, Liabilities	(100)	(8)
Securities collateral netting, Assets	0	0
Securities collateral netting, Liabilities	(5)	(13)
Net receivables/payables, Assets	1	5
Net receivables/payables, Liabilities	7	1
Equity contracts
Offsetting Assets and Liabilities [Line Items]
Notional Amount	293	189
Derivatives, Asset Fair Value	9	3
Derivatives, Liability Fair Value	7	1
Foreign exchange contracts
Offsetting Assets and Liabilities [Line Items]
Notional Amount	863	752
Derivatives, Asset Fair Value	12	13
Derivatives, Liability Fair Value	22	22
Interest rate contracts
Offsetting Assets and Liabilities [Line Items]
Notional Amount	23,634	23,518
Derivatives, Asset Fair Value	295	179
Derivatives, Liability Fair Value	371	137
Credit contracts
Offsetting Assets and Liabilities [Line Items]
Notional Amount	237	280
Derivatives, Asset Fair Value	0	0
Derivatives, Liability Fair Value	2	3
Not Designated as Hedging Instrument \| Equity contracts
Offsetting Assets and Liabilities [Line Items]
Notional Amount	400	329
Not Designated as Hedging Instrument \| Foreign exchange contracts
Offsetting Assets and Liabilities [Line Items]
Notional Amount	92	21
Not Designated as Hedging Instrument \| Interest rate contracts
Offsetting Assets and Liabilities [Line Items]
Notional Amount	25,027	26,011
Not Designated as Hedging Instrument \| Credit contracts
Offsetting Assets and Liabilities [Line Items]
Notional Amount	237	280
Held for sale
Offsetting Assets and Liabilities [Line Items]
Derivatives, Asset Fair Value	304	131
Derivatives, Liability Fair Value	77	53
Counterparty netting, Assets	(76)	(50)
Counterparty netting, Liabilities	(76)	(50)
Cash collateral netting, Assets	(206)	(62)
Cash collateral netting, Liabilities	0	0
Securities collateral netting, Assets	(17)	(11)
Securities collateral netting, Liabilities	0	(3)
Net receivables/payables, Assets	5	8
Net receivables/payables, Liabilities	1	0
Held for sale \| Equity contracts
Offsetting Assets and Liabilities [Line Items]
Notional Amount	1,753	1,427
Derivatives, Asset Fair Value	254	91
Derivatives, Liability Fair Value	20	2
Held for sale \| Foreign exchange contracts
Offsetting Assets and Liabilities [Line Items]
Notional Amount	37	22
Derivatives, Asset Fair Value	1	1
Derivatives, Liability Fair Value	1	0
Held for sale \| Interest rate contracts
Offsetting Assets and Liabilities [Line Items]
Notional Amount	2,228	2,134
Derivatives, Asset Fair Value	49	39
Derivatives, Liability Fair Value	56	51
Held for sale \| Credit contracts
Offsetting Assets and Liabilities [Line Items]
Notional Amount	0	1
Derivatives, Asset Fair Value	0	0
Derivatives, Liability Fair Value	0	0
Held for sale \| Not Designated as Hedging Instrument \| Equity contracts
Offsetting Assets and Liabilities [Line Items]
Notional Amount	1,753	1,427
Held for sale \| Not Designated as Hedging Instrument \| Foreign exchange contracts
Offsetting Assets and Liabilities [Line Items]
Notional Amount	18	9
Held for sale \| Not Designated as Hedging Instrument \| Interest rate contracts
Offsetting Assets and Liabilities [Line Items]
Notional Amount	2,227	2,151
Held for sale \| Not Designated as Hedging Instrument \| Credit contracts
Offsetting Assets and Liabilities [Line Items]
Notional Amount	$ 0	$ 1

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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