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Derivatives and Hedging Activities - Effect of Fair Value and Cash Flow Hedges on Income (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Interest expense — Long-term debt |  | $ (454) | $ (420) | $ (319)
Interest income — Loans |  | 4,267 | 4,023 | 3,677
Investment banking and debt placement fees |  | 630 | 650 | 603
Deposits |  | (853) | (517) | (278)
Other income | [1] | 68 | 176 | 153
Interest Expense, Long-Term Debt [Member] | Fair Value Hedging [Member] |  |  |  |
Gain (Loss) on Fair Value Hedges Recognized in Earnings [Abstract] |  |  |  |
Net income (expense) recognized on fair value hedges |  |  | (17) |
Interest Expense, Long-Term Debt [Member] | Cash Flow Hedging [Member] |  |  |  |
Cash Flow Hedges Derivative Instruments at Fair Value, Net [Abstract] |  |  |  |
Net income (expense) recognized on cash flow hedges |  | (1) |  | (4)
Interest Income [Member] | Fair Value Hedging [Member] |  |  |  |
Gain (Loss) on Fair Value Hedges Recognized in Earnings [Abstract] |  |  |  |
Net income (expense) recognized on fair value hedges |  |  | 0 |
Interest Income [Member] | Cash Flow Hedging [Member] |  |  |  |
Cash Flow Hedges Derivative Instruments at Fair Value, Net [Abstract] |  |  |  |
Net income (expense) recognized on cash flow hedges |  | 15 |  | 19
Investment Banking And Debt Placement [Member] | Fair Value Hedging [Member] |  |  |  |
Gain (Loss) on Fair Value Hedges Recognized in Earnings [Abstract] |  |  |  |
Net income (expense) recognized on fair value hedges |  |  | 0 |
Investment Banking And Debt Placement [Member] | Cash Flow Hedging [Member] |  |  |  |
Cash Flow Hedges Derivative Instruments at Fair Value, Net [Abstract] |  |  |  |
Net income (expense) recognized on cash flow hedges |  | 0 |  | 0
Interest Expense, Deposits [Member] | Fair Value Hedging [Member] |  |  |  |
Gain (Loss) on Fair Value Hedges Recognized in Earnings [Abstract] |  |  |  |
Net income (expense) recognized on fair value hedges |  |  | 1 |
Interest Expense, Deposits [Member] | Cash Flow Hedging [Member] |  |  |  |
Cash Flow Hedges Derivative Instruments at Fair Value, Net [Abstract] |  |  |  |
Net income (expense) recognized on cash flow hedges |  | 0 |  | 0
Other Income [Member] | Fair Value Hedging [Member] |  |  |  |
Gain (Loss) on Fair Value Hedges Recognized in Earnings [Abstract] |  |  |  |
Net income (expense) recognized on fair value hedges |  |  | 0 |
Other Income [Member] | Cash Flow Hedging [Member] |  |  |  |
Cash Flow Hedges Derivative Instruments at Fair Value, Net [Abstract] |  |  |  |
Gains (losses) (before tax) recognized in income for hedge ineffectiveness |  |  |  | 0
Net income (expense) recognized on cash flow hedges |  | 32 |  | 0
Interest Rate [Member] | Interest Expense, Long-Term Debt [Member] | Fair Value Hedging [Member] |  |  |  |
Gain (Loss) on Fair Value Hedges Recognized in Earnings [Abstract] |  |  |  |
Recognized on hedged items |  | (247) | (5) | 0
Recognized on derivatives designated as hedging instruments |  | 231 | (12) | 49
Net income (expense) recognized on fair value hedges |  | (16) |  | 49
Interest Rate [Member] | Interest Expense, Long-Term Debt [Member] | Cash Flow Hedging [Member] |  |  |  |
Cash Flow Hedges Derivative Instruments at Fair Value, Net [Abstract] |  |  |  |
Realized gains (losses) (pre-tax) reclassified from AOCI into net income |  | (1) | (2) | (4)
Gains (losses) (before tax) recognized in income for hedge ineffectiveness |  |  |  | 0
Net income (expense) recognized on cash flow hedges |  |  | (2) |
Interest Rate [Member] | Interest Income [Member] | Fair Value Hedging [Member] |  |  |  |
Gain (Loss) on Fair Value Hedges Recognized in Earnings [Abstract] |  |  |  |
Recognized on hedged items |  | 0 | 0 | 0
Recognized on derivatives designated as hedging instruments |  | 0 | 0 | 0
Net income (expense) recognized on fair value hedges |  | 0 |  | 0
Interest Rate [Member] | Interest Income [Member] | Cash Flow Hedging [Member] |  |  |  |
Cash Flow Hedges Derivative Instruments at Fair Value, Net [Abstract] |  |  |  |
Realized gains (losses) (pre-tax) reclassified from AOCI into net income |  | 15 | (68) | 19
Gains (losses) (before tax) recognized in income for hedge ineffectiveness |  |  |  | 0
Net income (expense) recognized on cash flow hedges |  |  | (68) |
Interest Rate [Member] | Investment Banking And Debt Placement [Member] | Fair Value Hedging [Member] |  |  |  |
Gain (Loss) on Fair Value Hedges Recognized in Earnings [Abstract] |  |  |  |
Recognized on hedged items |  | 0 | 0 | 0
Recognized on derivatives designated as hedging instruments |  | 0 | 0 | 0
Net income (expense) recognized on fair value hedges |  | 0 |  | 0
Interest Rate [Member] | Investment Banking And Debt Placement [Member] | Cash Flow Hedging [Member] |  |  |  |
Cash Flow Hedges Derivative Instruments at Fair Value, Net [Abstract] |  |  |  |
Realized gains (losses) (pre-tax) reclassified from AOCI into net income |  | 0 | 2 | 0
Gains (losses) (before tax) recognized in income for hedge ineffectiveness |  |  |  | 0
Net income (expense) recognized on cash flow hedges |  |  | 2 |
Interest Rate [Member] | Interest Expense, Deposits [Member] | Fair Value Hedging [Member] |  |  |  |
Gain (Loss) on Fair Value Hedges Recognized in Earnings [Abstract] |  |  |  |
Recognized on hedged items |  | (1) | 1 | 0
Recognized on derivatives designated as hedging instruments |  | 0 | 0 | 0
Net income (expense) recognized on fair value hedges |  | (1) |  | 0
Interest Rate [Member] | Interest Expense, Deposits [Member] | Cash Flow Hedging [Member] |  |  |  |
Cash Flow Hedges Derivative Instruments at Fair Value, Net [Abstract] |  |  |  |
Realized gains (losses) (pre-tax) reclassified from AOCI into net income |  | 0 | 0 | 0
Gains (losses) (before tax) recognized in income for hedge ineffectiveness |  |  |  | 0
Net income (expense) recognized on cash flow hedges |  |  | 0 |
Interest Rate [Member] | Other Income [Member] | Fair Value Hedging [Member] |  |  |  |
Gain (Loss) on Fair Value Hedges Recognized in Earnings [Abstract] |  |  |  |
Recognized on hedged items |  | 0 | 0 | 107
Recognized on derivatives designated as hedging instruments |  | 0 | 0 | (103)
Net income (expense) recognized on fair value hedges |  | 0 |  | 4
Interest Rate [Member] | Other Income [Member] | Cash Flow Hedging [Member] |  |  |  |
Cash Flow Hedges Derivative Instruments at Fair Value, Net [Abstract] |  |  |  |
Realized gains (losses) (pre-tax) reclassified from AOCI into net income |  | 0 | 31 | $ 0
Net income (expense) recognized on cash flow hedges |  |  | $ 31 |
Foreign Exchange Contract [Member] | Interest Expense, Long-Term Debt [Member] | Cash Flow Hedging [Member] |  |  |  |
Cash Flow Hedges Derivative Instruments at Fair Value, Net [Abstract] |  |  |  |
Realized gains (losses) (pre-tax) reclassified from AOCI into net income |  | 0 |  |
Foreign Exchange Contract [Member] | Interest Income [Member] | Cash Flow Hedging [Member] |  |  |  |
Cash Flow Hedges Derivative Instruments at Fair Value, Net [Abstract] |  |  |  |
Realized gains (losses) (pre-tax) reclassified from AOCI into net income |  | 0 |  |
Foreign Exchange Contract [Member] | Investment Banking And Debt Placement [Member] | Cash Flow Hedging [Member] |  |  |  |
Cash Flow Hedges Derivative Instruments at Fair Value, Net [Abstract] |  |  |  |
Realized gains (losses) (pre-tax) reclassified from AOCI into net income |  | 0 |  |
Foreign Exchange Contract [Member] | Interest Expense, Deposits [Member] | Cash Flow Hedging [Member] |  |  |  |
Cash Flow Hedges Derivative Instruments at Fair Value, Net [Abstract] |  |  |  |
Realized gains (losses) (pre-tax) reclassified from AOCI into net income |  | 0 |  |
Foreign Exchange Contract [Member] | Other Income [Member] | Cash Flow Hedging [Member] |  |  |  |
Cash Flow Hedges Derivative Instruments at Fair Value, Net [Abstract] |  |  |  |
Realized gains (losses) (pre-tax) reclassified from AOCI into net income |  | $ 32 |  |
[1] | Net securities gains (losses) totaled $20 million for the year ended December 31, 2019, less than $1 million for the year ended December 31, 2018, and $1 million for the year ended December 31, 2017. For 2019, 2018, and 2017, we did not have any impairment losses related to securities.

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- Definition Interest and fee income generated by loans the Entity intends and has the ability to hold for the foreseeable future, or until maturity or payoff, including commercial and consumer loans, whether domestic or foreign, which may consist of: (1) industrial and agricultural; (2) real estate; and (3) real estate construction loans; (4) trade financing; (5) lease financing; (6) home equity lines-of-credit; (7) automobile and other vehicle loans; and (8) credit card and other revolving-type loans. Also includes interest income for leases held by the Entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.1) -URI http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260 + Details
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