Annual report pursuant to Section 13 and 15(d)

Derivatives - Other Risk Management Derivatives (Details)

v3.8.0.1
Derivatives - Other Risk Management Derivatives (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Interest rate lock commitments      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (loss) on derivatives not designated as hedging $ 220 $ 533 $ 714
Mortgage banking income | Interest rate risk on mortgage banking income      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (loss) on derivatives not designated as hedging 8 461 254
Other income | Credit risk on loans      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (loss) on derivatives not designated as hedging (6) (107) (22)
Other income | Interest rate and foreign currency risk on ALM activities      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (loss) on derivatives not designated as hedging (36) (754) (222)
Personnel expense | Price risk on restricted stock awards      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (loss) on derivatives not designated as hedging $ 301 $ 9 $ (267)