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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.