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Fair Value Measurements (Assets And Liabilities Recorded At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities available-for-sale: | $ 16,323 | $ 19,012
Derivative assets: | 1,178 | 1,279
Total derivative liabilities | 1,508 | 1,695
U.S. Treasury securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities available-for-sale: | 1,681 | 2,664
Residential mortgage-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities available-for-sale: | 10,174 | 11,655
Commercial mortgage-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities available-for-sale: | 4,468 | 4,693
Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities available-for-sale: | 16,323 | 19,012
Derivative assets: | 1,178 | 1,279
Total assets at fair value | 17,643 | 20,427
Total derivative liabilities | 1,521 | 1,707
Deferred compensation plan liabilities | 97 | 92
Total liabilities at fair value | 1,618 | 1,799
Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities available-for-sale: | 1,681 | 2,664
Derivative assets: | 0 | 0
Total assets at fair value | 1,823 | 2,800
Total derivative liabilities | 0 | 0
Deferred compensation plan liabilities | 97 | 92
Total liabilities at fair value | 97 | 92
Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities available-for-sale: | 14,642 | 16,348
Derivative assets: | 1,178 | 1,279
Total assets at fair value | 15,820 | 17,627
Total derivative liabilities | 1,508 | 1,695
Deferred compensation plan liabilities | 0 | 0
Total liabilities at fair value | 1,508 | 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 | 13 | 12
Deferred compensation plan liabilities | 0 | 0
Total liabilities at fair value | 13 | 12
Recurring | Interest rate contracts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets: | 303 | 206
Total derivative liabilities | 660 | 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: | 303 | 206
Total derivative liabilities | 660 | 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: | 825 | 1,020
Total derivative liabilities | 805 | 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: | 825 | 1,020
Total derivative liabilities | 805 | 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: | 50 | 53
Total derivative liabilities | 43 | 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: | 50 | 53
Total derivative liabilities | 43 | 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 liabilities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total derivative liabilities | 13 | 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 | 13 | 12
Total liabilities at fair value | 13 | 12
Recurring | Deferred compensation plan assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Deferred compensation plan assets | 97 | 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 | 97 | 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 | 45 | 44
Recurring | Equity securities | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 45 | 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: | 1,681 | 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: | 1,681 | 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: | 10,174 | 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: | 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: | 10,174 | 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: | 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: | 4,468 | 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: | 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: | 4,468 | 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: | $ 0 | $ 0

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