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Debt (Details) $ / shares in Units, € in Millions, $ in Millions	3 Months Ended	9 Months Ended
	Jun. 30, 2019 USD ($)	Sep. 30, 2019 USD ($) item agreement $ / shares	Dec. 31, 2020 item	Sep. 30, 2019 EUR (€) item	Jul. 31, 2019 EUR (€)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 EUR (€)	Sep. 30, 2018 USD ($)	Sep. 30, 2018 EUR (€)
Debt Instrument
Total long-term debt		$ 5,814				$ 5,214		$ 5,508
Less amounts due within one year		302				33		21
Long-term debt		$ 5,512				5,181		5,487
Number financial maintenance covenants \| agreement		1
Maximum Leverage Ratio may increase \| item		0.5
Short-term loans and long-term debt due within one year		$ 376				160		152
Maximum
Debt Instrument
Leverage Ratio \| item		5.0		5.0
Maximum Borrowing Capacity		$ 3,000
Maximum \| Forecast
Debt Instrument
Leverage Ratio \| item			4.50
Prior Agreement
Debt Instrument
Interest charges for write-off of finance fees	$ 2
Secured Credit Agreement
Debt Instrument
Unused Credit		$ 1,200
Weighted average interest rate (as a percent)		3.26%		3.26%
Secured Credit Agreement \| Minimum
Debt Instrument
Interest rate margin, Eurocurrency Rate loans (as a percent)		1.00%		1.00%
Interest rate margin, Base Rate loans (as a percent)		0.00%
Secured Credit Agreement \| Maximum
Debt Instrument
Interest rate margin, Eurocurrency Rate loans (as a percent)		1.50%		1.50%
Interest rate margin, Base Rate loans (as a percent)		0.50%
Revolving Loans
Debt Instrument
Total long-term debt		$ 265
Revolving Loans \| Prior Agreement
Debt Instrument
Total long-term debt								335
Term Loan A
Debt Instrument
Total long-term debt		1,496
Face Value		1,500
Net proceeds, after deducting debt issuance costs		1,496
Term Loan A \| Prior Agreement
Debt Instrument
Total long-term debt						897		908
Other secured debt
Debt Instrument
Total long-term debt		454				404		329
Senior Notes 6.75%, due 2020 (250 million EUR at September 30, 2019 and 500 million EUR at December 31, 2018 and September 30, 2018)
Debt Instrument
Total long-term debt		$ 273		€ 250	€ 250	570	€ 500	580	€ 500
Interest rate, stated percentage		6.75%		6.75%
Additional interest charges for note repurchase premiums and write-off of unamortized finance fees		$ 24
Fair values of fixed rate debt obligations
Principal Amount		$ 273
Indicated Market Price (in dollars per share) \| $ / shares		$ 106.20
Fair Value		$ 290
Senior Notes 4.875%, due 2021 (330 million EUR)
Debt Instrument
Total long-term debt		$ 360		€ 330		376	330	382	330
Interest rate, stated percentage		4.875%		4.875%
Fair values of fixed rate debt obligations
Principal Amount		$ 361
Indicated Market Price (in dollars per share) \| $ / shares		$ 106.99
Fair Value		$ 386
Senior Notes 5.00%, due 2022
Debt Instrument
Total long-term debt		$ 498				497		497
Interest rate, stated percentage		5.00%		5.00%
Fair values of fixed rate debt obligations
Principal Amount		$ 500
Indicated Market Price (in dollars per share) \| $ / shares		$ 103.38
Fair Value		$ 517
Senior Notes 4.00%, due 2023
Debt Instrument
Total long-term debt		$ 307				306		306
Interest rate, stated percentage		4.00%		4.00%
Fair values of fixed rate debt obligations
Principal Amount		$ 310
Indicated Market Price (in dollars per share) \| $ / shares		$ 100.79
Fair Value		$ 312
Senior Notes 5.875%, due 2023
Debt Instrument
Total long-term debt		$ 690				688		687
Interest rate, stated percentage		5.875%		5.875%
Fair values of fixed rate debt obligations
Principal Amount		$ 700
Indicated Market Price (in dollars per share) \| $ / shares		$ 106.66
Fair Value		$ 747
Senior Notes 3.125%, due 2024 (725 million EUR)
Debt Instrument
Total long-term debt		$ 818		€ 725		825	€ 725	828	€ 725
Interest rate, stated percentage		3.125%		3.125%
Fair values of fixed rate debt obligations
Principal Amount		$ 793
Indicated Market Price (in dollars per share) \| $ / shares		$ 105.41
Fair Value		$ 836
Senior Notes 6.375%, due 2025
Debt Instrument
Total long-term debt		$ 296				295		295
Interest rate, stated percentage		6.375%		6.375%
Fair values of fixed rate debt obligations
Principal Amount		$ 300
Indicated Market Price (in dollars per share) \| $ / shares		$ 106.93
Fair Value		$ 321
Senior Notes, 5.375% due 2025
Debt Instrument
Total long-term debt		$ 298				297		297
Interest rate, stated percentage		5.375%		5.375%
Fair values of fixed rate debt obligations
Principal Amount		$ 300
Indicated Market Price (in dollars per share) \| $ / shares		$ 103.84
Fair Value		$ 312
Finance leases
Debt Instrument
Total long-term debt		43				45		48
Other
Debt Instrument
Total long-term debt		16				$ 14		$ 16
Revolving Credit Facility
Debt Instrument
Total long-term debt		$ 300
Additional default interest rate per annum applied to all obligations owed under the Agreement		2.00%
Revolving Credit Facility \| Minimum
Debt Instrument
Facility fee payable (as a percent)		0.20%
Revolving Credit Facility \| Maximum
Debt Instrument
Facility fee payable (as a percent)		0.30%
Multicurrency Revolving Credit Facility
Debt Instrument
Total long-term debt		$ 1,200