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Fair Value Measurements (Assets And Liabilities Recorded At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investment securities available-for-sale: |  | $ 18,295 | $ 19,012
Derivative assets: |  | 1,215 | 1,279
Total derivative liabilities |  | 1,465 | 1,695
U.S. Treasury securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investment securities available-for-sale: |  | 1,984 | 2,664
Residential mortgage-backed securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investment securities available-for-sale: | [1] | 11,531 | 11,655
Commercial mortgage-backed securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investment securities available-for-sale: | [1] | 4,780 | 4,693
Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investment securities available-for-sale: |  | 18,295 | 19,012
Derivative assets: |  | 1,215 | 1,279
Total assets at fair value |  | 19,659 | 20,427
Total derivative liabilities |  | 1,477 | 1,707
Deferred compensation plan liabilities |  | 96 | 92
Total liabilities at fair value |  | 1,573 | 1,799
Recurring | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investment securities available-for-sale: |  | 1,984 | 2,664
Derivative assets: |  | 0 | 0
Total assets at fair value |  | 2,133 | 2,800
Total derivative liabilities |  | 0 | 0
Deferred compensation plan liabilities |  | 96 | 92
Total liabilities at fair value |  | 96 | 92
Recurring | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investment securities available-for-sale: |  | 16,311 | 16,348
Derivative assets: |  | 1,215 | 1,279
Total assets at fair value |  | 17,526 | 17,627
Total derivative liabilities |  | 1,465 | 1,695
Deferred compensation plan liabilities |  | 0 | 0
Total liabilities at fair value |  | 1,465 | 1,695
Recurring | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investment securities available-for-sale: |  | 0 | 0
Derivative assets: |  | 0 | 0
Total assets at fair value |  | 0 | 0
Total derivative liabilities |  | 12 | 12
Deferred compensation plan liabilities |  | 0 | 0
Total liabilities at fair value |  | 12 | 12
Recurring | Interest rate contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets: |  | 199 | 206
Total derivative liabilities |  | 473 | 644
Recurring | Interest rate contracts | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets: |  | 0 | 0
Total derivative liabilities |  | 0 | 0
Recurring | Interest rate contracts | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets: |  | 199 | 206
Total derivative liabilities |  | 473 | 644
Recurring | Interest rate contracts | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets: |  | 0 | 0
Total derivative liabilities |  | 0 | 0
Recurring | Energy contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets: |  | 960 | 1,020
Total derivative liabilities |  | 942 | 1,006
Recurring | Energy contracts | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets: |  | 0 | 0
Total derivative liabilities |  | 0 | 0
Recurring | Energy contracts | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets: |  | 960 | 1,020
Total derivative liabilities |  | 942 | 1,006
Recurring | Energy contracts | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets: |  | 0 | 0
Total derivative liabilities |  | 0 | 0
Recurring | Foreign exchange contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets: |  | 56 | 53
Total derivative liabilities |  | 50 | 45
Recurring | Foreign exchange contracts | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets: |  | 0 | 0
Total derivative liabilities |  | 0 | 0
Recurring | Foreign exchange contracts | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets: |  | 56 | 53
Total derivative liabilities |  | 50 | 45
Recurring | Foreign exchange contracts | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets: |  | 0 | 0
Total derivative liabilities |  | 0 | 0
Recurring | Other financial derivative |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total derivative liabilities |  | 12 | 12
Recurring | Other financial derivative | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total derivative liabilities |  | 0 | 0
Recurring | Other financial derivative | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total derivative liabilities |  | 0 | 0
Recurring | Other financial derivative | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total derivative liabilities |  | 12 | 12
Total liabilities at fair value |  | 12 | 12
Recurring | Deferred compensation plan assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Deferred compensation plan assets |  | 96 | 92
Recurring | Deferred compensation plan assets | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Deferred compensation plan assets |  | 96 | 92
Recurring | Deferred compensation plan assets | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Deferred compensation plan assets |  | 0 | 0
Recurring | Deferred compensation plan assets | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Deferred compensation plan assets |  | 0 | 0
Recurring | Equity securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities |  | 53 | 44
Recurring | Equity securities | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities |  | 53 | 44
Recurring | Equity securities | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities |  | 0 | 0
Recurring | Equity securities | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities |  | 0 | 0
Recurring | U.S. Treasury securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investment securities available-for-sale: |  | 1,984 | 2,664
Recurring | U.S. Treasury securities | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investment securities available-for-sale: |  | 1,984 | 2,664
Recurring | U.S. Treasury securities | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investment securities available-for-sale: |  | 0 | 0
Recurring | U.S. Treasury securities | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investment securities available-for-sale: |  | 0 | 0
Recurring | Residential mortgage-backed securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investment securities available-for-sale: | [1] | 11,531 | 11,655
Recurring | Residential mortgage-backed securities | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investment securities available-for-sale: | [1] | 0 | 0
Recurring | Residential mortgage-backed securities | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investment securities available-for-sale: | [1] | 11,531 | 11,655
Recurring | Residential mortgage-backed securities | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investment securities available-for-sale: | [1] | 0 | 0
Recurring | Commercial mortgage-backed securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investment securities available-for-sale: | [1] | 4,780 | 4,693
Recurring | Commercial mortgage-backed securities | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investment securities available-for-sale: | [1] | 0 | 0
Recurring | Commercial mortgage-backed securities | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investment securities available-for-sale: | [1] | 4,780 | 4,693
Recurring | Commercial mortgage-backed securities | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investment securities available-for-sale: | [1] | $ 0 | $ 0
[1] | Issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.

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