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Summary of Significant Accounting Policies Fee and Other Income (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Gain Contingencies [Line Items]                      
Fee and other income $ 414 $ 175 $ 174 $ 203 $ 225 $ 259 $ 556 $ 308 $ 966 $ 1,348 $ 5,887
Private Label Securities Settlements [Member]                      
Gain Contingencies [Line Items]                      
Fee and other income                 $ 245 $ 21 $ 4,800