Fair Value Measurements - Level Three Measurements (Details) - Level Three - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
IRLCs, net
Activity in assets classified within Level Three of the valuation hierarchy
Balance, beginning of period	$ 16	$ 39	$ 18	$ 21
Purchases, Issuances, Sales and Settlements:
Purchases	0	0	0	0
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	(65)	(92)	(180)	(252)
Purchases, Issuances, Sales and Settlements Total	(65)	(92)	(180)	(252)
Realized and unrealized gains (losses) included in:
Realized and unrealized gains (losses)	62	100	175	278
Transfers into Level Three	0	0	0	0
Transfers out of Level Three	0	0	0	0
Balance, end of period	13	47	13	47
IRLCs, net \| Gain on loans held for sale, net
Realized and unrealized gains (losses) included in:
Realized and unrealized gains (losses)	62	100	175	278
IRLCs, net \| Loan servicing income, net
Realized and unrealized gains (losses) included in:
Realized and unrealized gains (losses)	0	0	0	0
IRLCs, net \| Net interest expense
Realized and unrealized gains (losses) included in:
Realized and unrealized gains (losses)	0	0	0	0
MLHS
Activity in assets classified within Level Three of the valuation hierarchy
Balance, beginning of period	32	42	47	39
Purchases, Issuances, Sales and Settlements:
Purchases	2	3	7	11
Issuances	2	2	5	5
Sales	(3)	(6)	(20)	(20)
Settlements	(2)	(4)	(11)	(9)
Purchases, Issuances, Sales and Settlements Total	(1)	(5)	(19)	(13)
Realized and unrealized gains (losses) included in:
Realized and unrealized gains (losses)	(5)	0	(4)	2
Transfers into Level Three	23	13	34	33
Transfers out of Level Three	(4)	(5)	(13)	(16)
Balance, end of period	45	45	45	45
MLHS \| Gain on loans held for sale, net
Realized and unrealized gains (losses) included in:
Realized and unrealized gains (losses)	(6)	0	(6)	0
MLHS \| Loan servicing income, net
Realized and unrealized gains (losses) included in:
Realized and unrealized gains (losses)	0	0	0	0
MLHS \| Net interest expense
Realized and unrealized gains (losses) included in:
Realized and unrealized gains (losses)	1	0	2	2
MSRs
Activity in assets classified within Level Three of the valuation hierarchy
Balance, beginning of period	555	679	690	880
Purchases, Issuances, Sales and Settlements:
Purchases	0	0	0	0
Issuances	10	15	28	45
Sales	(30)	(3)	(125)	(8)
Settlements	0	0	0	0
Purchases, Issuances, Sales and Settlements Total	(20)	12	(97)	37
Realized and unrealized gains (losses) included in:
Realized and unrealized gains (losses)	(35)	(46)	(93)	(272)
Transfers into Level Three	0	0	0	0
Transfers out of Level Three	0	0	0	0
Balance, end of period	500	645	500	645
MSRs \| Gain on loans held for sale, net
Realized and unrealized gains (losses) included in:
Realized and unrealized gains (losses)	0	0	0	0
MSRs \| Loan servicing income, net
Realized and unrealized gains (losses) included in:
Realized and unrealized gains (losses)	(35)	(46)	(93)	(272)
MSRs \| Net interest expense
Realized and unrealized gains (losses) included in:
Realized and unrealized gains (losses)	0	$ 0	0	$ 0
MSRs Secured Liability
Activity in assets classified within Level Three of the valuation hierarchy
Balance, beginning of period	(114)		0
Purchases, Issuances, Sales and Settlements:
Purchases	0		0
Issuances	(354)		(467)
Sales	0		0
Settlements	14		15
Purchases, Issuances, Sales and Settlements Total	(340)		(452)
Realized and unrealized gains (losses) included in:
Realized and unrealized gains (losses)	14		12
Transfers into Level Three	0		0
Transfers out of Level Three	0		0
Balance, end of period	(440)		(440)
MSRs Secured Liability \| Gain on loans held for sale, net
Realized and unrealized gains (losses) included in:
Realized and unrealized gains (losses)	0		0
MSRs Secured Liability \| Loan servicing income, net
Realized and unrealized gains (losses) included in:
Realized and unrealized gains (losses)	28		27
MSRs Secured Liability \| Net interest expense
Realized and unrealized gains (losses) included in:
Realized and unrealized gains (losses)	(14)		(15)
Liability to Deliver MSRs
Activity in assets classified within Level Three of the valuation hierarchy
Balance, beginning of period	0		0
Purchases, Issuances, Sales and Settlements:
Purchases	0		0
Issuances	0		0
Sales	0		0
Settlements	1		1
Purchases, Issuances, Sales and Settlements Total	1		1
Realized and unrealized gains (losses) included in:
Realized and unrealized gains (losses)	(3)		(3)
Transfers into Level Three	0		0
Transfers out of Level Three	0		0
Balance, end of period	(2)		(2)
Liability to Deliver MSRs \| Gain on loans held for sale, net
Realized and unrealized gains (losses) included in:
Realized and unrealized gains (losses)	(3)		(3)
Liability to Deliver MSRs \| Loan servicing income, net
Realized and unrealized gains (losses) included in:
Realized and unrealized gains (losses)	0		0
Liability to Deliver MSRs \| Net interest expense
Realized and unrealized gains (losses) included in:
Realized and unrealized gains (losses)	$ 0		$ 0

Fair Value, Realized and Unrealized Gains (Losses) Included in Level 3 of Valuation Hierarchy [Abstract]

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

Amount of issuances of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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-Publisher FASB
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-Section 50
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- Definition

Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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- Definition

Amount of purchases, (sales), issuances and (settlements) of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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- Definition

Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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-Publisher FASB
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Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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- Definition

Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy.

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- Definition

Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy.

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- Definition

Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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