Debt and Interest Costs - Long term debt (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Long-term debt
Other (including debt issuance costs)	$ (43)	$ (37)
Long-term debt, Total	6,531	6,631
Less: Current portion of long-term debt	(8)	(113)
Long-term debt excluding current maturities	6,523	6,518
Senior Notes 5.25 percent, due July 2025
Long-term debt
Long-term Debt, Gross	$ 1,000	1,000
Interest rate (as a percent)	5.25%
Senior Notes 4.375 percent, due December 2020
Long-term debt
Long-term Debt, Gross	$ 1,000	1,000
Interest rate (as a percent)	4.375%
Senior Notes 4.00 percent , due November 2023
Long-term debt
Long-term Debt, Gross	$ 1,000	1,000
Interest rate (as a percent)	4.00%
Senior Notes 4.375 percent, euro denominated, due December 2023
Long-term debt
Long-term Debt, Gross	$ 812	840
Interest rate (as a percent)	4.375%
Senior Notes 5.00 percent, due March 2022
Long-term debt
Long-term Debt, Gross	$ 750	750
Interest rate (as a percent)	5.00%
Senior Notes 4.875 Percent Due March 2026 [Member]
Long-term debt
Long-term Debt, Gross	$ 750
Interest rate (as a percent)	4.875%
Senior Notes 3.50 Percent, euro denominated, due December 2020
Long-term debt
Long-term Debt, Gross	$ 464	480
Interest rate (as a percent)	3.50%
Term A Loan, due June 2021
Long-term debt
Long-term Debt, Gross	$ 798	1,313
Multi-currency U.S. dollar revolver, due March 2021
Long-term debt
Long-term Debt, Gross		$ 285

Net total of debt issuance costs, debt discount (premium) and other long term debt not elsewhere specified.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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