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Derivatives (Details) - Not designated as hedging instruments - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Interest rate lock commitments    
Notional amount of derivatives    
Notional $ 1,591 $ 1,048
Forward delivery commitments    
Notional amount of derivatives    
Notional 2,987 2,468
Option contracts    
Notional amount of derivatives    
Notional 70 125
MSR-related agreements    
Notional amount of derivatives    
Notional $ 4,867 $ 3,945