Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Mortgage Servicing Rights (Details)

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Fair Value Measurements - Mortgage Servicing Rights (Details)
$ in Millions
Sep. 30, 2017
USD ($)
Fair Value Disclosures [Abstract]  
Impact of 10 percent decrease in prepayment speed $ 88
Impact of 20 percent decrease in prepayment speed 183
Impact of 10 percent increase in prepayment speed (81)
Impact of 20 percent increase in prepayment speed (156)
Impact of 100 basis points decrease in option adjusted spread 74
Impact of 200 basis points decrease in option adjusted spread 154
Impact of 100 basis points increase in option adjusted spread (69)
Impact of 200 basis points increase in option adjusted spread $ (135)