Investments - Estimated Fair Values of Investments Classified as Available for Sale (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Gross Amortized Cost	$ 4,079
Gross Unrealized Gains	1
Gross Unrealized Losses	(3)
Estimated Fair Value	4,077
Equity and cost method investments	27	$ 31
Corporate debt securities \| Short-term investments
Schedule of Available-for-sale Securities [Line Items]
Gross Amortized Cost	1,251
Gross Unrealized Gains	0
Gross Unrealized Losses	(1)
Estimated Fair Value	1,250
Corporate debt securities \| Long-term investments
Schedule of Available-for-sale Securities [Line Items]
Gross Amortized Cost	2,232
Gross Unrealized Gains	1
Gross Unrealized Losses	(2)
Estimated Fair Value	2,231
Government and agency securities \| Short-term investments
Schedule of Available-for-sale Securities [Line Items]
Gross Amortized Cost	590
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Estimated Fair Value	590
Time deposits \| Short-term investments
Schedule of Available-for-sale Securities [Line Items]
Gross Amortized Cost	6	29
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	$ 6	$ 29

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

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-Publisher FASB

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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-Publisher FASB

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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-Publisher FASB

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-Topic 210

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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