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Derivative Financial Instruments - Fair Value Hedges Basis Adjusments (Details) - Fair Value Hedges - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
AFS securities    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedged Asset / Liability Basis $ 467 $ 493
AFS securities | Items Currently Designated    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedge Basis Adjustment 13 5
AFS securities | Items No Longer Designated    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedge Basis Adjustment 56 54
Loans and leases    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedged Asset / Liability Basis 572 562
Loans and leases | Items Currently Designated    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedge Basis Adjustment 21 0
Loans and leases | Items No Longer Designated    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedge Basis Adjustment (1) (3)
Long-term debt    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedged Asset / Liability Basis 13,652 15,397
Long-term debt | Items Currently Designated    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedge Basis Adjustment 212 (98)
Long-term debt | Items No Longer Designated    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedge Basis Adjustment $ (1) $ 12