Income Taxes, Change in Unrecognized Tax Benefits (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of year	$ 5,528us-gaap_UnrecognizedTaxBenefits	$ 6,069us-gaap_UnrecognizedTaxBenefits
Additions:
For tax positions related to the current year	412	427
For tax positions related to prior years	324	283
Reductions:
For tax positions related to prior years	(213)	(540)
Lapse of statute of limitations	(50)	(74)
Settlements with tax authorities	(999)	(637)
Balance at end of year	$ 5,002us-gaap_UnrecognizedTaxBenefits	$ 5,528us-gaap_UnrecognizedTaxBenefits

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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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