Debt (Long-Term Debt) (Details) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Capital Lease Obligation	$ 238	$ 10
Total	1,237	10
Unamortized discount for the Notes above	(6)	(8)
Subtotal	1,994	2,992
Capital Lease Obligation	0	236
Total	1,994	3,228
2.125% Notes due on May 19, 2016(1)
Debt Instrument [Line Items]
Long-term debt, current portion	999	0
Long-Term Debt	0	1,000
Unamortized discount for the Notes above	$ (1)
Long-term debt, interest rate	2.125%
Long-term debt, maturity date	May 19, 2016
3.625% Notes due on May 19, 2021
Debt Instrument [Line Items]
Long-Term Debt	$ 1,000	1,000
Long-term debt, interest rate	3.625%
Long-term debt, maturity date	May 19, 2021
3.375% Notes due on February 25, 2024
Debt Instrument [Line Items]
Long-Term Debt	$ 1,000	$ 1,000
Long-term debt, interest rate	3.375%
Long-term debt, maturity date	Feb. 25, 2024

Amount of capital lease obligation due within one year or the normal operating cycle, if longer.

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid more than one year (or one operating cycle, if longer) after the balance sheet date.

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Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

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Amount of long-term debt and capital leases due within one year or the normal operating cycle, if longer.

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Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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