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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