Income Taxes (Narrative) (Details) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2017 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
Income Tax Disclosure [Abstract]
Income tax rate	29.40%	31.20%
Decrease in income tax percentage	0.073	0.042
Valuation allowance related to deferred income tax assets for foreign tax credit carryforwards	$ 232
Tax benefits related to prior year audits		$ 152
Tax benefits related to the reversal of tax accruals	36
Tax expense for tax reserves related to the calculation of certain foreign tax credits	114	114
Unrecognized tax benefits	194	194	$ 169
Unrecognized tax benefits that would impact the effective tax rate	126	126	67
Unrecognized tax benefits that would impact deferred taxes	68	68	$ 102
Possible decrease in unrecognized tax benefits	$ 7	$ 7

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, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences from reserves, classified as other.

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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 foreign tax credit.

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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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