Fair Value Measurements (Details 6) - Level Three - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Interest rate lock commitments
Activity in assets classified within Level Three of the valuation hierarchy
Balance, beginning of period	$ 28	$ 38	$ 21	$ 22
Purchases, Issuances, Sales and Settlements:
Purchases	0	0	0	0
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	(90)	(70)	(160)	(135)
Purchases, Issuances, Sales and Settlements Total	(90)	(70)	(160)	(135)
Realized and unrealized gains (losses) included in:
Realized and unrealized gains (losses)	101	54	178	135
Transfers into Level Three	0	0	0	0
Transfers out of Level Three	0	0	0	0
Balance, end of period	39	22	39	22
Interest rate lock commitments \| Gain on loans held for sale, net
Realized and unrealized gains (losses) included in:
Realized and unrealized gains (losses)	101	54	178	135
Interest rate lock commitments \| Change in fair value of MSRs
Realized and unrealized gains (losses) included in:
Realized and unrealized gains (losses)	0	0	0	0
Interest rate lock commitments \| Interest income
Realized and unrealized gains (losses) included in:
Realized and unrealized gains (losses)	0	0	0	0
Mortgage loans held for sale
Activity in assets classified within Level Three of the valuation hierarchy
Balance, beginning of period	41	41	39	42
Purchases, Issuances, Sales and Settlements:
Purchases	3	10	8	17
Issuances	2	2	3	2
Sales	(6)	(4)	(14)	(8)
Settlements	(4)	(3)	(5)	(5)
Purchases, Issuances, Sales and Settlements Total	(5)	5	(8)	6
Realized and unrealized gains (losses) included in:
Realized and unrealized gains (losses)	1	2	2	4
Transfers into Level Three	9	8	20	15
Transfers out of Level Three	(4)	(8)	(11)	(19)
Balance, end of period	42	48	42	48
Mortgage loans held for sale \| Gain on loans held for sale, net
Realized and unrealized gains (losses) included in:
Realized and unrealized gains (losses)	0	0	0	1
Mortgage loans held for sale \| Change in fair value of MSRs
Realized and unrealized gains (losses) included in:
Realized and unrealized gains (losses)	0	0	0	0
Mortgage loans held for sale \| Interest income
Realized and unrealized gains (losses) included in:
Realized and unrealized gains (losses)	1	2	2	3
Mortgage servicing rights
Activity in assets classified within Level Three of the valuation hierarchy
Balance, beginning of period	770	986	880	1,005
Purchases, Issuances, Sales and Settlements:
Purchases	0	0	0	0
Issuances	17	28	30	48
Sales	(3)	(12)	(5)	(25)
Settlements	0	0	0	0
Purchases, Issuances, Sales and Settlements Total	14	16	25	23
Realized and unrealized gains (losses) included in:
Realized and unrealized gains (losses)	(105)	18	(226)	(8)
Transfers into Level Three	0	0	0	0
Transfers out of Level Three	0	0	0	0
Balance, end of period	679	1,020	679	1,020
Mortgage servicing rights \| Gain on loans held for sale, net
Realized and unrealized gains (losses) included in:
Realized and unrealized gains (losses)	0	0	0	0
Mortgage servicing rights \| Change in fair value of MSRs
Realized and unrealized gains (losses) included in:
Realized and unrealized gains (losses)	(105)	18	(226)	(8)
Mortgage servicing rights \| Interest income
Realized and unrealized gains (losses) included in:
Realized and unrealized gains (losses)	$ 0	$ 0	$ 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
-Subparagraph (c)(1)
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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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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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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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-Topic 820
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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
-Name Accounting Standards Codification
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-Section 50
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- Definition

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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-Name Accounting Standards Codification
-Topic 820
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Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy.

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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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