Loans and Allowance for Credit Losses, PCI, Accretable Yield (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended	60 Months Ended
Sep. 30, 2014	Sep. 30, 2014	Dec. 31, 2013
Change in accretable yield related to PCI loans [Abstract]
Total, beginning of period	$ 18,418	$ 17,392	$ 10,447
Addition of accretable yield due to acquisitions	0	0	132
Accretion into interest income	(446)	(1,183)	(11,184)
Accretion into noninterest income due to sales	0	(35)	(393)
Reclassification from nonaccretable difference for loans with improving credit-related cash flows	13	2,089	6,325
Changes in expected cash flows that do not affect nonaccretable difference	(6)	(284)	12,065
Total, end of period	$ 17,979	$ 17,979	$ 17,392

Amount of the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

Reference 1: 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

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(2)

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

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- Definition

Amount of increase of reclassification from nonaccretable difference to the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

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- Definition

The current period recognition due to accretion into interest income of the excess of a loan's cash flows expected to be collected over the investor's initial investment in the loan. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that were 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.

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- Definition

The current period recognition due to accretion into noninterest income due to sales of the excess of a loan's cash flows expected to be collected over the investor's initial investment in the loan. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that were 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.

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- Definition

The current period addition of accretable yield due to the acquisition of loans. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that were 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

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- Definition

Represents changes in interest cash flows for 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, due to the impact of modifications incorporated into the quarterly assessment of expected future cash flows and/or changes in interest rates on variable rate loans.

+ References

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