Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Credit Extension Commitments Narrative (Details)

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Commitments and Contingencies - Credit Extension Commitments Narrative (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]    
Legally binding unfunded commitments syndicated $ 11,300 $ 12,100
Carrying amount credit extension commitments syndicated 780 779
Deferred revenue 18 17
Other liabilities reserve for unfunded lending commitments 762 762
Notional amount of credit extension commitments under fair value option 4,900 7,000
Unfunded loan commitments    
Other Commitments [Line Items]    
Fair value carrying amount liabilities $ 101 $ 173