Mortgage Banking Activities, Analysis of Changes in Fair Value MSRs (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Changes in MSRs measured at fair value
Fair value, beginning of period			$ 14,649
Changes in fair value:
Net changes in valuation model inputs or assumptions	$ (1,078)	$ 345	(1,969)	$ 1,675
Changes due to collection/realization of expected cash flows over time	(561)	(460)	(1,043)	(943)
Total changes in fair value	(1,639)	(115)	(3,012)	732
Fair value, end of period	12,096		12,096
Carried at fair value [Member]
Changes in MSRs measured at fair value
Fair value, beginning of period	13,336	15,041	14,649	13,625
Servicing from securitizations or asset transfers (1)	400	486	741	1,059
Sales and other (2)	(1)	(1)	(282)	(5)
Net additions	399	485	459	1,054
Changes in fair value:
Net changes in valuation model inputs or assumptions	(1,078)	345	(1,969)	1,675
Changes due to collection/realization of expected cash flows over time	(561)	(460)	(1,043)	(943)
Total changes in fair value	(1,639)	(115)	(3,012)	732
Fair value, end of period	12,096	15,411	12,096	15,411
Carried at fair value [Member] \| Mortgage interest rates [Member]
Changes in fair value:
Net changes in valuation model inputs or assumptions	(1,153)	376	(2,093)	1,629
Carried at fair value [Member] \| Servicing and foreclosure costs [Member]
Changes in fair value:
Net changes in valuation model inputs or assumptions	(22)	30	(10)	64
Carried at fair value [Member] \| Discount rates [Member]
Changes in fair value:
Net changes in valuation model inputs or assumptions	(109)	0	(9)	0
Carried at fair value [Member] \| Prepayment estimates and other [Member]
Changes in fair value:
Net changes in valuation model inputs or assumptions	$ 206	$ (61)	$ 143	$ (18)

Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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Amount of increase (decrease) from changes in fair value classified as other for a contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

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The net additions (reductions) in the fair value of servicing assets from the origination of mortgage servicing rights (MSRs) or disposals of servicing assets at fair value.

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