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Derivatives and Hedging Activities - Pre-Tax Net Gains (Losses) on Derivatives Not Designated as Hedging Instruments (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total net gains (losses) | $ 55 | $ 70 | $ 49
Interest Rate [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total net gains (losses) | 44 | 37 | 28
Foreign Exchange Contract [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total net gains (losses) | 45 | 42 | 41
Commodity [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total net gains (losses) | 6 | 8 | 6
Credit [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total net gains (losses) | (42) | (28) | (19)
Other [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total net gains (losses) | 2 | 11 | (7)
Corporate Services Income [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total net gains (losses) | 91 | 90 | 78
Corporate Services Income [Member] | Interest Rate [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total net gains (losses) | 46 | 38 | 29
Corporate Services Income [Member] | Foreign Exchange Contract [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total net gains (losses) | 45 | 42 | 41
Corporate Services Income [Member] | Commodity [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total net gains (losses) | 6 | 8 | 6
Corporate Services Income [Member] | Credit [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total net gains (losses) | (6) | 2 | 2
Corporate Services Income [Member] | Other [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total net gains (losses) | 0 | 0 | 0
Consumer Mortgage Income [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total net gains (losses) | 2 | (1) | (1)
Consumer Mortgage Income [Member] | Interest Rate [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total net gains (losses) | 0 | 0 | 0
Consumer Mortgage Income [Member] | Foreign Exchange Contract [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total net gains (losses) | 0 | 0 | 0
Consumer Mortgage Income [Member] | Commodity [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total net gains (losses) | 0 | 0 | 0
Consumer Mortgage Income [Member] | Credit [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total net gains (losses) | 0 | 0 | 0
Consumer Mortgage Income [Member] | Other [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total net gains (losses) | 2 | (1) | (1)
Other Income [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total net gains (losses) | (38) | (19) | (28)
Other Income [Member] | Interest Rate [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total net gains (losses) | (2) | (1) | (1)
Other Income [Member] | Foreign Exchange Contract [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total net gains (losses) | 0 | 0 | 0
Other Income [Member] | Commodity [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total net gains (losses) | 0 | 0 | 0
Other Income [Member] | Credit [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total net gains (losses) | (36) | (30) | (21)
Other Income [Member] | Other [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total net gains (losses) | $ 0 | $ 12 | $ (6)

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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4CC -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109998890-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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