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Fair Value Measurements (Assets And Liabilities Recorded At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investment securities available-for-sale: |  | $ 15,886 | $ 16,869
Derivative assets: |  | 832 | 1,019
Total derivative liabilities |  | 949 | 1,206
U.S. Treasury securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investment securities available-for-sale: |  | 1,169 | 1,605
Residential mortgage-backed securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investment securities available-for-sale: | [1] | 9,825 | 10,519
Commercial mortgage-backed securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investment securities available-for-sale: | [1] | 4,892 | 4,745
Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investment securities available-for-sale: |  | 15,886 | 16,869
Derivative assets: |  | 832 | 1,019
Total assets at fair value |  | 16,856 | 18,031
Total derivative liabilities |  | 960 | 1,218
Deferred compensation plan liabilities |  | 91 | 104
Total liabilities at fair value |  | 1,051 | 1,322
Recurring | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investment securities available-for-sale: |  | 1,169 | 1,605
Derivative assets: |  | 0 | 0
Total assets at fair value |  | 1,307 | 1,748
Total derivative liabilities |  | 0 | 0
Deferred compensation plan liabilities |  | 91 | 104
Total liabilities at fair value |  | 91 | 104
Recurring | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investment securities available-for-sale: |  | 14,717 | 15,264
Derivative assets: |  | 832 | 1,019
Total assets at fair value |  | 15,549 | 16,283
Total derivative liabilities |  | 949 | 1,206
Deferred compensation plan liabilities |  | 0 | 0
Total liabilities at fair value |  | 949 | 1,206
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 |  | 11 | 12
Deferred compensation plan liabilities |  | 0 | 0
Total liabilities at fair value |  | 11 | 12
Recurring | Interest rate contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets: |  | 197 | 225
Total derivative liabilities |  | 340 | 435
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: |  | 197 | 225
Total derivative liabilities |  | 340 | 435
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: |  | 593 | 758
Total derivative liabilities |  | 572 | 736
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: |  | 593 | 758
Total derivative liabilities |  | 572 | 736
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: |  | 42 | 36
Total derivative liabilities |  | 37 | 35
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: |  | 42 | 36
Total derivative liabilities |  | 37 | 35
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 liabilities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total derivative liabilities |  | 11 | 12
Recurring | Other financial derivative liabilities | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total derivative liabilities |  | 0 | 0
Recurring | Other financial derivative liabilities | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total derivative liabilities |  | 0 | 0
Recurring | Other financial derivative liabilities | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total derivative liabilities |  | 11 | 12
Total liabilities at fair value |  | 11 | 12
Recurring | Deferred compensation plan assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Deferred compensation plan assets |  | 91 | 104
Recurring | Deferred compensation plan assets | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Deferred compensation plan assets |  | 91 | 104
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 |  | 47 | 39
Recurring | Equity securities | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities |  | 47 | 39
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: |  | 1,169 | 1,605
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: |  | 1,169 | 1,605
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] | 9,825 | 10,519
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] | 9,825 | 10,519
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] | 4,892 | 4,745
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] | 4,892 | 4,745
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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