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Derivative Financial Instruments - Fair Value Hedges Basis Adjusments (Details) - Fair Value Hedges - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
AFS securities    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedged Asset / Liability Basis $ 444 $ 473
AFS securities | Items Currently Designated    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedge Basis Adjustment 0 0
AFS securities | Items No Longer Designated    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedge Basis Adjustment 55 65
Loans and leases    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedged Asset / Liability Basis 494 528
Loans and leases | Items Currently Designated    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedge Basis Adjustment 6 3
Loans and leases | Items No Longer Designated    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedge Basis Adjustment 13 15
Long-term debt    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedged Asset / Liability Basis 28,563 28,557
Long-term debt | Items Currently Designated    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedge Basis Adjustment 1,107 174
Long-term debt | Items No Longer Designated    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedge Basis Adjustment $ 22 $ 23