Income Taxes (Narrative) (Details) $ in Millions	3 Months Ended
Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Income Tax Disclosure [Abstract]
Income tax rate	33.00%
Change in income tax percentage	(2.3)
Tax benefits related to prior audit years	$ 42
Excess tax benefits for share-based awards that vested during period	16
Unrecognized tax benefits	138	$ 169
Unrecognized tax benefits that would impact the effective tax rate	36	67
Unrecognized tax benefits that would impact deferred taxes	102	102
Possible decrease in unrecognized tax benefits	77
Valuation allowance	$ 240	$ 240

Effective Income Tax Rate Reconciliation, Increase (Decrease), Percent

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Unrecognized Tax Benefits that Would Impact Deferred Tax Rate

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Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible equity-based compensation costs.

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Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement.

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Amount of unrecognized tax benefits.

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

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