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Allowance for Loan and Lease Losses Allowance for Loan and Lease Losses - Loss Sharing Arrangements (Details) - Loss Sharing Agreement [Member] - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]          
Reduction in Charge-offs due to loss sharing agreements $ 47 $ 40 $ 136 $ 121  
Reduction in provision for loan and lease losses 64 $ 48 183 $ 130  
Expected reimbursement netted in allowance for loan losses $ 190   $ 190   $ 143