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Summary of Significant Accounting Policies - Debt Issuance Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Recent Accounting Pronouncements
Other long-term assets, net	$ 386	$ 431
Senior notes, net of unamortized discounts and debt issuance costs	9,698	8,699
Depreciation and amortization	432	384	$ 365
Interest expense, net	$ 432	348	313
ASU 2015-03, Simplifying the Presentation of Debt Issuance Costs | New Accounting Pronouncement, Early Adoption, Effect
Recent Accounting Pronouncements
Other long-term assets, net		(58)
Senior notes, net of unamortized discounts and debt issuance costs		(58)
Depreciation and amortization		(8)	(10)
Interest expense, net		$ 8	$ 10

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- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Amount of the cost of borrowed funds accounted for as interest expense.

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- Definition

Aggregate carrying amount, as of the balance sheet date, of noncurrent assets not separately disclosed in the balance sheet. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer).

+ References

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Carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. Senior note holders are paid off in full before any payments are made to junior note holders.

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