Income Taxes Income Tax Reconciliation (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Provision at statutory rate	$ 1,236	$ 1,213	$ 1,080
Permanent Differences [Abstract]
Foreign income taxed at different rates	(709)	(607)	(617)
Gain on sale of Skype	2,991	0	0
Change in valuation allowance	(141)	0	3
Stock-based compensation	42	33	(14)
State taxes, net of federal benefit	34	(26)	39
Tax credits	(27)	(43)	1
Divested business	0	21	(41)
Other	59	19	24
Income tax expense (benefit)	$ 3,485us-gaap_IncomeTaxExpenseBenefit	$ 610us-gaap_IncomeTaxExpenseBenefit	$ 475us-gaap_IncomeTaxExpenseBenefit

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Amount 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 tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority noncontrolling interest income (loss), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, increase (decrease) in enacted tax rate, prior year income taxes, increase (decrease) in deferred tax asset valuation allowance, and other adjustments.

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