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Face (par) amount of debt instrument at time of issuance.

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Notes Payable and Long-Term Debt (Details)	12 Months Ended
Notes Payable and Long-Term Debt (Details)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 EUR (€)	Dec. 31, 2018 USD ($)	Jul. 20, 2016 USD ($)
Debt Instrument [Line Items]
Short-term Debt, Weighted Average Interest Rate, at Point in Time	2.50%	2.50%	4.30%
Debt, Weighted Average Interest Rate	2.80%	2.80%	3.40%
Long-term Debt, by Current and Noncurrent [Abstract]
Long-term Debt	$ 1,926,000,000		$ 2,081,000,000
Current portion of long-term debt	252,000,000		140,000,000
Long-term debt, net of current portion	1,674,000,000		1,941,000,000
Long-term Debt, by Maturity [Abstract]
2020	286,000,000
2021	3,000,000
2022	562,000,000
2023	1,000,000
2024	0
After 2024	1,121,000,000
Total payments	1,973,000,000
Less: unamortized discounts	13,000,000
Total	1,960,000,000
Multi-currency revolving credit agreement, maximum borrowing capacity	1,500,000,000
Estimated fair value of senior unsecured notes	2,025,000,000		2,058,000,000
Debt, difference between fair value and carrying value	106,000,000		8,000,000
Outstanding letters of credit	28,000,000		43,000,000
Short Term Borrowings [Member]
Short-term debt
Total short-term debt	34,000,000		33,000,000
Senior Notes Due October 2019
Long-term Debt, by Current and Noncurrent [Abstract]
Long-term Debt			135,000,000
Senior Notes Due September 2020
Long-term Debt, by Current and Noncurrent [Abstract]
Long-term Debt	251,000,000		251,000,000
Debt instrument par value	$ 250,000,000
Debt instrument stated interest rate	4.625%	4.625%
Debt instrument maturity period	Sep. 15, 2020
Senior Notes Due November 2022
Long-term Debt, by Current and Noncurrent [Abstract]
Long-term Debt	$ 558,000,000		570,000,000
Debt instrument par value \| €		€ 500,000,000
Debt instrument stated interest rate	1.80%	1.80%
Debt instrument maturity period	Nov. 07, 2022
Senior Notes Due March 2025
Long-term Debt, by Current and Noncurrent [Abstract]
Long-term Debt	$ 497,000,000		497,000,000
Debt instrument par value	$ 500,000,000
Debt instrument stated interest rate	3.375%	3.375%
Debt instrument maturity period	Mar. 15, 2025
Senior Notes Due February 2029
Long-term Debt, by Current and Noncurrent [Abstract]
Long-term Debt	$ 119,000,000		119,000,000
Debt instrument par value	$ 121,000,000
Debt instrument stated interest rate	7.125%	7.125%
Debt instrument maturity period	Feb. 15, 2029
Senior Notes Due March 2045
Long-term Debt, by Current and Noncurrent [Abstract]
Long-term Debt	$ 494,000,000		494,000,000
Debt instrument par value	$ 500,000,000
Debt instrument stated interest rate	4.375%	4.375%
Debt instrument maturity period	Mar. 15, 2045
Term Loan Facilities And Other [Member]
Long-term Debt, by Current and Noncurrent [Abstract]
Long-term Debt	$ 7,000,000		15,000,000
Revolving Credit Facility [Member]
Long-term Debt, by Maturity [Abstract]
Multi-currency revolving credit agreement, current borrowing capacity	1,200,000,000
Commercial Paper [Member]
Long-term Debt, by Maturity [Abstract]
Multi-currency revolving credit agreement, current borrowing capacity	1,200,000,000
Interest Rate Swap [Member]
Debt Instrument [Line Items]
Derivative, Notional Amount				$ 384,000,000
2016 swap termination event [Member] \| Unamortized portion of debt derivative [Member] \| Senior Notes Due September 2020
Long-term Debt, by Current and Noncurrent [Abstract]
Derivative assets	$ 1,000,000		$ 2,000,000