Loans and Allowance for Credit Losses, PCI, Allowance for Credit Losses (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	72 Months Ended
Jun. 30, 2015	Jun. 30, 2015	Dec. 31, 2014
Changes in allowance for PCI loan losses [Abstract]
Balance, beginning of period	$ 9	$ 11	$ 0
Provision for loan losses	0	5	1,733
Charge-offs	(2)	(9)	(1,722)
Balance, end of period	7	7	11
Commercial Portfolio Segment [Member]
Changes in allowance for PCI loan losses [Abstract]
Balance, beginning of period	9	11	0
Provision for loan losses	0	5	1,629
Charge-offs	(2)	(9)	1,618
Balance, end of period	7	7	11
Pick-a-pay [Member]
Changes in allowance for PCI loan losses [Abstract]
Balance, beginning of period	0	0	0
Provision for loan losses	0	0	0
Charge-offs	0	0	0
Balance, end of period	0	0	0
Other Consumer [Member]
Changes in allowance for PCI loan losses [Abstract]
Balance, beginning of period	0	0	0
Provision for loan losses	0	0	104
Charge-offs	0	0	104
Balance, end of period	$ 0	$ 0	$ 0

Reserve for loans impairments recorded after acquisition as a result of current information and events which result in it being probable that estimated cash flows will be less than previously expected or because actual cash flows are less than cash flows previously expected. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that was acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (b)(2)

-URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 30

-Section 15

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538

+ Details

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- Definition

Reflects the amount of financing receivables that were acquired with deteriorated credit quality that have been removed, or charged off, from both loan receivables and the reserve for credit losses, typically because they are considered to be not salvageable or have been purchased by unconsolidated collection entities.

+ References

No definition available.

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- Definition

Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Changes In Allowance For Loan Losses Abstract.

+ References

No definition available.

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- Definition

Expense recorded to recognize an impairment of loans after acquisition. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that was acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

+ References

No definition available.

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