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, 2018
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]    
Legally binding unfunded commitments syndicated $ 10,700 $ 11,000
Carrying amount credit extension commitments syndicated 813 793
Deferred revenue 16 16
Other liabilities reserve for unfunded lending commitments 797 777
Notional amount of credit extension commitments under fair value option 3,100 4,800
Unfunded loan commitments    
Other Commitments [Line Items]    
Fair value carrying amount liabilities $ 169 $ 120