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Financial Derivatives (Gains (Losses) Recognized on Fair Value and Cash Flow Hedges in Consolidated Income Statement) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Loans, interest income | $ 8,927 | $ 10,525 | $ 9,580
Investment securities, interest income | 2,041 | 2,426 | 2,261
Borrowed funds, interest expense | 718 | 1,811 | 1,632
Total noninterest income | 6,955 | 6,874 | 6,469
Other |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total noninterest income | 1,364 | 1,473 | 1,205
Fair Value Hedging | Designated as Hedging Instrument | Investment Securities | Investment Securities Interest Income |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (loss) on related hedged items recognized in income | 208 | 187 | (53)
Gain (loss) on derivatives recognized in income | (202) | (178) | 60
Interest settlements on derivatives | (9) | 13 | 3
Fair Value Hedging | Designated as Hedging Instrument | Borrowings | Borrowed Funds Interest Expense |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (loss) on related hedged items recognized in income | (1,059) | (808) | 151
Gain (loss) on derivatives recognized in income | 959 | 659 | (262)
Interest settlements on derivatives | 480 | 79 | 80
Cash Flow Hedging | Designated as Hedging Instrument | Loans | Investment Securities Interest Income |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of derivative gains (losses) reclassified from AOCI | 375 | 9 | 41
Cash Flow Hedging | Designated as Hedging Instrument | Investment Securities | Investment Securities Interest Income |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of derivative gains (losses) reclassified from AOCI | 40 | 9 | 11
Cash Flow Hedging | Designated as Hedging Instrument | Other Income | Noninterest Income |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of derivative gains (losses) reclassified from AOCI | $ 6 | $ 19 | $ 8

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- Definition Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=121577467&loc=d3e76258-113986 + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5618551-113959 + Details
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- Definition The aggregate interest and fee income generated by: (1) loans the Entity has positive intent and 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: (a) industrial and agricultural; (b) real estate; and (c) real estate construction loans; (d) trade financing; (e) lease financing; (f) home equity lines-of-credit; (g) automobile and other vehicle loans; and (h) credit card and other revolving-type loans and (2) loans and leases held-for-sale which may include mortgage loans, direct financing, and sales-type leases. + 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=120399700&loc=SL114874048-224260 + Details
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