Employee Stock-Based Incentives - Compensation Expense (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Noncash compensation expense related to employee stock-based incentive plans
Cost of prior grants of restricted stock units RSUs and stock appreciation rights SARs that are amortized over their applicable vesting periods	$ 1,371	$ 1,440	$ 1,810
Accrual of estimated costs of RSUs and SARs to be granted in future periods to full-career eligible employees	819	779	735
Total noncash compensation expense related to employee stock-based incentive plans	2,190us-gaap_ShareBasedCompensation	2,219us-gaap_ShareBasedCompensation	2,545us-gaap_ShareBasedCompensation
Compensation cost related to unvested awards not charged to net income	$ 758
Weighted average period for cost expected to be amortized into compensation expense	1 year

Expense related to the cost of prior grants of share-based compensation awards.

No definition available.

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- Definition

Expense related to accruals for future grants of share-based compensation awards to retirement eligible employees.

+ References

No definition available.

+ Details

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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