Servicing Activities - Activity in the total loan servicing portfolio unpaid principal balance associated with capitalized MSRs (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017
Activity in the loan servicing portfolio associated with capitalized servicing rights
Balance, beginning of period	$ 148,155
Balance, end of period	129,024
Capitalized MSRs
Activity in the loan servicing portfolio associated with capitalized servicing rights
Balance, end of period	52,891
MSRs Under Secured Borrowing Arrangement \| Capitalized MSRs
Activity in the loan servicing portfolio associated with capitalized servicing rights
Balance, beginning of period	49,193	$ 0
Additions from loans sold with servicing retained	0	0
Payoffs and curtailments	(4,027)	(80)
Sales that have been derecognized	0	0
Sales accounted for as secured borrowing	604	13,164
Balance, end of period	45,770	13,084
MSRs Owned \| Capitalized MSRs
Activity in the loan servicing portfolio associated with capitalized servicing rights
Balance, beginning of period	8,592	84,657
Additions from loans sold with servicing retained	871	1,605
Payoffs and curtailments	(744)	(6,649)
Sales that have been derecognized	(994)	(12,516)
Sales accounted for as secured borrowing	(604)	(13,164)
Balance, end of period	$ 7,121	$ 53,933

No definition available.

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- Definition

The principal amount of new servicing assets acquired or created during the current period through purchases or from transfers of financial assets.

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- Definition

The principal amount of reductions in servicing assets including reductions from loan payoffs and recurring cash flows.

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No definition available.

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- Definition

The principal amount of reductions in servicing assets related to sales.

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No definition available.

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- Definition

Servicing Asset Principal Sales, Accounted For As Secured Borrowing

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No definition available.

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- Definition

Principal amount as of the balance sheet date of loans included in the capitalized portfolio, where the entity has the rights to net future revenues from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements. Includes principal amount as of the balance sheet date of loans subserviced, held for sale, or where the entity otherwise is contractually obligated to perform servicing activities.

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No definition available.

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- Details

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- Details

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