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Derivatives and Hedging Activities - Pre-Tax Net Gains (Losses) on Derivatives Not Designated as Hedging Instruments (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items] |  |
Total net gains (losses) | $ (4) | $ 14
Interest rate |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Total net gains (losses) | 6 | 2
Foreign exchange |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Total net gains (losses) | 11 | 12
Commodity |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Total net gains (losses) | 4 | 2
Credit |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Total net gains (losses) | (4) | (15)
Other |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Total net gains (losses) | (21) | 13
Corporate services income |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Total net gains (losses) | 26 | 9
Corporate services income | Interest rate |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Total net gains (losses) | 6 | 11
Corporate services income | Foreign exchange |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Total net gains (losses) | 11 | 12
Corporate services income | Commodity |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Total net gains (losses) | 4 | 2
Corporate services income | Credit |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Total net gains (losses) | 5 | (16)
Corporate services income | Other |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Total net gains (losses) | 0 | 0
Consumer mortgage income |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Total net gains (losses) | 1 | 4
Consumer mortgage income | Interest rate |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Total net gains (losses) | 0 | 0
Consumer mortgage income | Foreign exchange |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Total net gains (losses) | 0 | 0
Consumer mortgage income | Commodity |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Total net gains (losses) | 0 | 0
Consumer mortgage income | Credit |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Total net gains (losses) | 0 | 0
Consumer mortgage income | Other |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Total net gains (losses) | 1 | 4
Other income |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Total net gains (losses) | (31) | 1
Other income | Interest rate |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Total net gains (losses) | 0 | (9)
Other income | Foreign exchange |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Total net gains (losses) | 0 | 0
Other income | Commodity |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Total net gains (losses) | 0 | 0
Other income | Credit |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Total net gains (losses) | (9) | 1
Other income | Other |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Total net gains (losses) | $ (22) | $ 9

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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=121590274&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=121590274&loc=SL5624171-113959 + Details
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