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Fair Value Measurements - Fair Value Disclosures of Financial Instruments (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
ASSETS |  |  |
Trading account assets |  | $ 811 | $ 735
Derivative assets |  | 1,524 | 1,798
Securities available for sale |  | 33,923 | 27,556
Amortized cost |  | 6,857 | 7,595
Held-to-maturity securities |  | 7,159 | 8,023
Loans, net of unearned income (residential) |  | 100,926 | 101,185
Loans held for sale | [1] | 2,296 | 1,583
LIABILITIES |  |  |
Long-term debt |  | 12,499 | 13,709
Carrying Amount |  |  |
ASSETS |  |  |
Trading account assets |  | 811 | 735
Other investments |  | 621 | 621
Loans, net of unearned income (residential) |  | 11 | 11
Loans held for sale |  | 236 | 264
Securities available for sale |  | 33,923 | 27,556
Amortized cost |  | 6,857 | 7,595
Loans, net of unearned income (residential) |  | 99,477 | 99,548
Loans held for sale |  | 2,060 | 1,319
Short-term investments |  |  | 0
Cash and short-term investments |  | 16,314 | 17,285
LIABILITIES |  |  |
Time deposits |  | 5,219 | 5,743
Short-term borrowings |  | 1,025 | 979
Long-term debt |  | 12,499 | 13,709
Deposits with no stated maturity |  | 136,964 | 129,539
Fair Value |  |  |
ASSETS |  |  |
Trading account assets |  | 811 | 735
Other investments |  | 621 | 621
Loans, net of unearned income (residential) |  | 11 | 11
Loans held for sale |  | 236 | 264
Securities available for sale |  | 33,923 | 27,556
Held-to-maturity securities |  | 7,159 | 8,023
Loans, net of unearned income (residential) |  | 99,253 | 98,946
Loans held for sale |  | 2,060 | 1,319
Short-term investments |  |  | 0
Cash and short-term investments |  | 16,314 | 17,285
LIABILITIES |  |  |
Time deposits |  | 5,234 | 5,765
Short-term borrowings |  | 1,025 | 979
Long-term debt |  | 13,123 | 14,659
Deposits with no stated maturity |  | 136,964 | 129,539
Level 1 | Fair Value |  |  |
ASSETS |  |  |
Trading account assets |  | 0 | 0
Other investments |  | 0 | 0
Loans, net of unearned income (residential) |  | 0 | 0
Loans held for sale |  | 0 | 0
Securities available for sale |  | 0 | 0
Held-to-maturity securities |  | 0 | 0
Loans, net of unearned income (residential) |  | 0 | 0
Loans held for sale |  | 0 | 0
Short-term investments |  |  | 0
Cash and short-term investments |  | 16,314 | 17,285
LIABILITIES |  |  |
Time deposits |  | 0 | 0
Short-term borrowings |  | 143 | 256
Long-term debt |  | 12,396 | 13,925
Deposits with no stated maturity |  | 0 | 0
Level 2 | Fair Value |  |  |
ASSETS |  |  |
Trading account assets |  | 811 | 735
Other investments |  | 13 | 0
Loans, net of unearned income (residential) |  | 0 | 0
Loans held for sale |  | 236 | 264
Securities available for sale |  | 33,901 | 27,543
Held-to-maturity securities |  | 7,159 | 8,023
Loans, net of unearned income (residential) |  | 0 | 0
Loans held for sale |  | 0 | 0
Short-term investments |  |  | 0
Cash and short-term investments |  | 0 | 0
LIABILITIES |  |  |
Time deposits |  | 5,234 | 5,765
Short-term borrowings |  | 882 | 723
Long-term debt |  | 727 | 734
Deposits with no stated maturity |  | 136,964 | 129,539
Level 3 | Fair Value |  |  |
ASSETS |  |  |
Trading account assets |  | 0 | 0
Other investments |  | 542 | 555
Loans, net of unearned income (residential) |  | 11 | 11
Loans held for sale |  | 0 | 0
Securities available for sale |  | 22 | 13
Held-to-maturity securities |  | 0 | 0
Loans, net of unearned income (residential) |  | 99,253 | 98,946
Loans held for sale |  | 2,060 | 1,319
Short-term investments |  |  | 0
Cash and short-term investments |  | 0 | 0
LIABILITIES |  |  |
Time deposits |  | 0 | 0
Short-term borrowings |  | 0 | 0
Long-term debt |  | 0 | 0
Deposits with no stated maturity |  | 0 | 0
Measured at NAV | Fair Value |  |  |
ASSETS |  |  |
Other investments |  | 66 | 66
Derivatives Not Designated as Hedging Instruments | Carrying Amount |  |  |
ASSETS |  |  |
Derivative assets |  | 1,421 | 1,676
LIABILITIES |  |  |
Derivative liabilities |  | 177 | 154
Derivatives Not Designated as Hedging Instruments | Fair Value |  |  |
ASSETS |  |  |
Derivative assets |  | 1,421 | 1,675
Derivative assets, Netting Adjustment |  | (316) | (433)
LIABILITIES |  |  |
Derivative liabilities |  | 177 | 154
Derivative liabilities, Netting Adjustment |  | (861) | (675)
Derivatives Not Designated as Hedging Instruments | Level 1 | Fair Value |  |  |
ASSETS |  |  |
Derivative assets |  | 74 | 78
LIABILITIES |  |  |
Derivative liabilities |  | 64 | 72
Derivatives Not Designated as Hedging Instruments | Level 2 | Fair Value |  |  |
ASSETS |  |  |
Derivative assets |  | 1,625 | 1,939
LIABILITIES |  |  |
Derivative liabilities |  | 966 | 746
Derivatives Not Designated as Hedging Instruments | Level 3 | Fair Value |  |  |
ASSETS |  |  |
Derivative assets |  | 38 | 91
LIABILITIES |  |  |
Derivative liabilities |  | 8 | 11
Derivatives Designated as Hedging Instruments | Carrying Amount |  |  |
ASSETS |  |  |
Derivative assets |  | 103 | 123
LIABILITIES |  |  |
Derivative liabilities |  | 6 | (3)
Derivatives Designated as Hedging Instruments | Fair Value |  |  |
ASSETS |  |  |
Derivative assets |  | 103 | 123
Derivative assets, Netting Adjustment |  | 58 | 53
LIABILITIES |  |  |
Derivative liabilities |  | 6 | (3)
Derivative liabilities, Netting Adjustment |  | 0 | 0
Derivatives Designated as Hedging Instruments | Level 1 | Fair Value |  |  |
ASSETS |  |  |
Derivative assets |  | 0 | 0
LIABILITIES |  |  |
Derivative liabilities |  | 0 | 0
Derivatives Designated as Hedging Instruments | Level 2 | Fair Value |  |  |
ASSETS |  |  |
Derivative assets |  | 45 | 70
LIABILITIES |  |  |
Derivative liabilities |  | 6 | (3)
Derivatives Designated as Hedging Instruments | Level 3 | Fair Value |  |  |
ASSETS |  |  |
Derivative assets |  | 0 | 0
LIABILITIES |  |  |
Derivative liabilities |  | $ 0 | $ 0
[1] | Total loans held for sale include real estate — residential mortgage loans held for sale at fair value of $236 million at March 31, 2021, and $264 million at December 31, 2020.

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- Definition Amount of time deposit liabilities, including certificates of deposit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=116652737&loc=d3e64164-112818 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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- Definition Debt (bills, notes or bonds) that are issued by the government of the United States which are short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References No definition available. + Details
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