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Fair Value Measurements (Assets And Liabilities Recorded At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |  |
Investment Securities, Available-for-sale |  | $ 16,986 | $ 15,028
Derivative assets |  | 928 | 700
Derivative liabilities |  | 747 | 229
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 |  | 2,993 | 4,658
Residential mortgage-backed securities |  |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |  |
Investment Securities, Available-for-sale | [1] | 13,288 | 10,370
Commercial Mortgage Backed Securities |  |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |  |
Investment Securities, Available-for-sale | [1] | 705 |
Recurring |  |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |  |
Investment Securities, Available-for-sale |  | 16,986 | 15,028
Derivative assets |  | 928 | 700
Total assets at fair value |  | 18,089 | 15,885
Derivative liabilities |  | 760 | 240
Deferred compensation plan liabilities |  | 113 | 107
Total liabilities at fair value |  | 873 | 347
Recurring | Level 1 |  |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |  |
Investment Securities, Available-for-sale |  | 2,993 | 4,658
Derivative assets |  | 0 | 0
Total assets at fair value |  | 3,168 | 4,815
Derivative liabilities |  | 0 | 0
Deferred compensation plan liabilities |  | 113 | 107
Total liabilities at fair value |  | 113 | 107
Recurring | Level 2 |  |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |  |
Investment Securities, Available-for-sale |  | 13,993 | 10,370
Derivative assets |  | 902 | 661
Total assets at fair value |  | 14,895 | 11,031
Derivative liabilities |  | 747 | 229
Deferred compensation plan liabilities |  | 0 | 0
Total liabilities at fair value |  | 747 | 229
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 |  | 26 | 39
Total assets at fair value |  | 26 | 39
Derivative liabilities |  | 13 | 11
Deferred compensation plan liabilities |  | 0 | 0
Total liabilities at fair value |  | 13 | 11
Recurring | Interest rate contracts |  |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |  |
Derivative assets |  | 239 | 531
Derivative liabilities |  | 69 | 61
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 |  | 213 | 492
Derivative liabilities |  | 69 | 61
Recurring | Interest rate contracts | Level 3 |  |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |  |
Derivative assets |  | 26 | 39
Derivative liabilities |  | 0 | 0
Recurring | Energy derivative contracts |  |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |  |
Derivative assets |  | 670 | 151
Derivative liabilities |  | 662 | 149
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 |  | 670 | 151
Derivative liabilities |  | 662 | 149
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 |  | 19 | 18
Derivative liabilities |  | 16 | 19
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 |  | 19 | 18
Derivative liabilities |  | 16 | 19
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 |  | 13 | 11
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 | Deferred compensation plan assets |  |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |  |
Deferred compensation plan assets |  | 113 | 107
Recurring | Deferred compensation plan assets | Level 1 |  |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |  |
Deferred compensation plan assets |  | 113 | 107
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, FV-NI |  | 62 | 50
Recurring | Equity and other non-debt securities | Level 1 |  |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |  |
Equity Securities, FV-NI |  | 62 | 50
Recurring | Equity and other non-debt securities | Level 2 |  |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |  |
Equity Securities, FV-NI |  | 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, FV-NI |  | 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 |  | 2,993 | 4,658
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 |  | 2,993 | 4,658
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 | [1] | 13,288 | 10,370
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 | [1] | 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 | [1] | 13,288 | 10,370
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 | [1] | 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 | [1] | 705 |
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 | [1] | 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 | [1] | 705 |
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 | [1] | $ 0 |
[1] | Issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.

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