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Fair Value Measurements (Assets And Liabilities Recorded At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Investment Securities, Available-for-sale | $ 16,869 | $ 19,012
Derivative assets | 1,019 | 1,279
Derivative liabilities | 1,206 | 1,695
U.S. Treasury and other U.S. government agency securities |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Investment Securities, Available-for-sale | 1,605 | 2,664
Commercial Mortgage Backed Securities |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Investment Securities, Available-for-sale | 4,745 | 4,693
Recurring |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Investment Securities, Available-for-sale | 16,869 | 19,012
Derivative assets | 1,019 | 1,279
Total assets at fair value | 18,031 | 20,427
Derivative liabilities | 1,218 | 1,707
Deferred compensation plan liabilities | 104 | 92
Total liabilities at fair value | 1,322 | 1,799
Recurring | Level 1 |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Investment Securities, Available-for-sale | 1,605 | 2,664
Derivative assets | 0 | 0
Total assets at fair value | 1,748 | 2,800
Derivative liabilities | 0 | 0
Deferred compensation plan liabilities | 104 | 92
Total liabilities at fair value | 104 | 92
Recurring | Level 2 |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Investment Securities, Available-for-sale | 15,264 | 16,348
Derivative assets | 1,019 | 1,279
Total assets at fair value | 16,283 | 17,627
Derivative liabilities | 1,206 | 1,695
Deferred compensation plan liabilities | 0 | 0
Total liabilities at fair value | 1,206 | 1,695
Recurring | Level 3 |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Investment Securities, Available-for-sale | 0 | 0
Derivative assets | 0 | 0
Total assets at fair value | 0 | 0
Derivative liabilities | 12 | 12
Deferred compensation plan liabilities | 0 | 0
Total liabilities at fair value | 12 | 12
Recurring | Interest rate contracts |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Derivative assets | 225 | 206
Derivative liabilities | 435 | 644
Recurring | Interest rate contracts | Level 1 |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Derivative assets | 0 | 0
Derivative liabilities | 0 | 0
Recurring | Interest rate contracts | Level 2 |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Derivative assets | 225 | 206
Derivative liabilities | 435 | 644
Recurring | Interest rate contracts | Level 3 |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Derivative assets | 0 | 0
Derivative liabilities | 0 | 0
Recurring | Energy derivative contracts |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Derivative assets | 758 | 1,020
Derivative liabilities | 736 | 1,006
Recurring | Energy derivative contracts | Level 1 |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Derivative assets | 0 | 0
Derivative liabilities | 0 | 0
Recurring | Energy derivative contracts | Level 2 |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Derivative assets | 758 | 1,020
Derivative liabilities | 736 | 1,006
Recurring | Energy derivative contracts | Level 3 |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Derivative assets | 0 | 0
Derivative liabilities | 0 | 0
Recurring | Foreign exchange contracts |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Derivative assets | 36 | 53
Derivative liabilities | 35 | 45
Recurring | Foreign exchange contracts | Level 1 |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Derivative assets | 0 | 0
Derivative liabilities | 0 | 0
Recurring | Foreign exchange contracts | Level 2 |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Derivative assets | 36 | 53
Derivative liabilities | 35 | 45
Recurring | Foreign exchange contracts | Level 3 |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Derivative assets | 0 | 0
Derivative liabilities | 0 | 0
Recurring | Derivative Financial Instruments, Liabilities |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Derivative liabilities | 12 | 12
Recurring | Derivative Financial Instruments, Liabilities | Level 1 |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Derivative liabilities | 0 | 0
Recurring | Derivative Financial Instruments, Liabilities | Level 2 |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Derivative liabilities | 0 | 0
Recurring | Derivative Financial Instruments, Liabilities | Level 3 |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Total liabilities at fair value | 12 | 12
Recurring | Deferred compensation plan assets |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Deferred compensation plan assets | 104 | 92
Recurring | Deferred compensation plan assets | Level 1 |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Deferred compensation plan assets | 104 | 92
Recurring | Deferred compensation plan assets | Level 2 |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Deferred compensation plan assets | 0 | 0
Recurring | Deferred compensation plan assets | Level 3 |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Deferred compensation plan assets | 0 | 0
Recurring | Equity and other non-debt securities |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Equity Securities | 39 | 44
Recurring | Equity and other non-debt securities | Level 1 |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Equity Securities | 39 | 44
Recurring | Equity and other non-debt securities | Level 2 |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Equity Securities | 0 | 0
Recurring | Equity and other non-debt securities | Level 3 |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Equity Securities | 0 | 0
Recurring | U.S. Treasury and other U.S. government agency securities |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Investment Securities, Available-for-sale | 1,605 | 2,664
Recurring | U.S. Treasury and other U.S. government agency securities | Level 1 |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Investment Securities, Available-for-sale | 1,605 | 2,664
Recurring | U.S. Treasury and other U.S. government agency securities | Level 2 |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Investment Securities, Available-for-sale | 0 | 0
Recurring | U.S. Treasury and other U.S. government agency securities | Level 3 |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Investment Securities, Available-for-sale | 0 | 0
Recurring | Residential mortgage-backed securities |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Investment Securities, Available-for-sale | 10,519 | 11,655
Recurring | Residential mortgage-backed securities | Level 1 |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Investment Securities, Available-for-sale | 0 | 0
Recurring | Residential mortgage-backed securities | Level 2 |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Investment Securities, Available-for-sale | 10,519 | 11,655
Recurring | Residential mortgage-backed securities | Level 3 |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Investment Securities, Available-for-sale | 0 | 0
Recurring | Commercial Mortgage Backed Securities |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Investment Securities, Available-for-sale | 4,745 | 4,693
Recurring | Commercial Mortgage Backed Securities | Level 1 |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Investment Securities, Available-for-sale | 0 | 0
Recurring | Commercial Mortgage Backed Securities | Level 2 |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Investment Securities, Available-for-sale | 4,745 | 4,693
Recurring | Commercial Mortgage Backed Securities | Level 3 |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Investment Securities, Available-for-sale | $ 0 | $ 0

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