Annual report pursuant to Section 13 and 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
Dec. 31, 2017
Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]    
Legally binding unfunded commitments syndicated $ 11,000 $ 12,100
Carrying amount credit extension commitments syndicated 793 779
Deferred revenue 16 17
Other liabilities reserve for unfunded lending commitments 777 762
Notional amount of credit extension commitments under fair value option 4,800 7,000
Unfunded loan commitments    
Other Commitments [Line Items]    
Fair value carrying amount liabilities $ 120 $ 173