Income Taxes (Narrative) (Details) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
Income Tax Disclosure [Abstract]
Income tax rate	31.60%	32.20%
Change in income tax percentage	0.031	0.028
Tax benefits related to prior year audits	$ 110	$ 152
Excess tax benefits for share-based awards that vested during period		19
Unrecognized tax benefits	48	48	$ 169
Unrecognized tax benefits that would impact the effective tax rate	40	40	67
Unrecognized tax benefits that would impact deferred taxes	8	8	102
Possible decrease in unrecognized tax benefits	21	21
Valuation allowance	$ 240	$ 240	$ 240

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

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Tax Adjustments, Settlements, and Unusual Provisions, Prior Audit Years

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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 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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