Income Taxes Unrecognized Tax Benefits (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Gross amounts of unrecognized tax benefits, beginning of period	$ 334us-gaap_UnrecognizedTaxBenefits	$ 340us-gaap_UnrecognizedTaxBenefits	$ 286us-gaap_UnrecognizedTaxBenefits
Increases related to prior period tax positions	35	104	60
Decreases related to prior period tax positions	(18)	(143)	(24)
Increases related to current period tax positions	61	37	19
Settlements	(16)	(4)	(1)
Gross amounts of unrecognized tax benefits, end of period	396us-gaap_UnrecognizedTaxBenefits	334us-gaap_UnrecognizedTaxBenefits	340us-gaap_UnrecognizedTaxBenefits
Unrecognized tax benefits increases	96
Unrecognized tax benefit decreases	34
Unrecognized tax benefits that would impact effective tax rate	314
Interest and penalties, net of tax benefits, in uncertain tax positions	2
Unrecognized tax benefits, interest and penalites accrued	$ 71	$ 77

Unrecognized Tax Benefits, Decrease, Total

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Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Net of Tax Benefits

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Unrecognized Tax Benefits, Increase, Total

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

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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 accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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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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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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