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
Mar. 31, 2018
USD ($)
Fair Value Disclosures [Abstract]  
Impact of 10 percent decrease in prepayment speed $ 72
Impact of 20 percent decrease in prepayment speed 149
Impact of 10 percent increase in prepayment speed 67
Impact of 20 percent increase in prepayment speed 129
Impact of 100 basis points decrease in option adjusted spread 70
Impact of 200 basis points decrease in option adjusted spread 146
Impact of 100 basis points increase in option adjusted spread 66
Impact of 200 basis points increase in option adjusted spread $ 127