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Debt (Details) $ / shares in Units, € in Millions, $ in Millions	1 Months Ended		3 Months Ended		9 Months Ended
	Aug. 31, 2020 USD ($)	May 31, 2020 USD ($)	Dec. 31, 2021	Sep. 30, 2021 USD ($) $ / shares	Sep. 30, 2021 USD ($) agreement $ / shares	Sep. 30, 2021 EUR (€)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 EUR (€)	Sep. 30, 2020 USD ($)	Sep. 30, 2020 EUR (€)
Debt Instrument
Total long-term debt				$ 4,890	$ 4,890		$ 5,087		$ 5,296
Less amounts due within one year				37	37		142		133
Long-term debt				$ 4,853	$ 4,853		4,945		5,163
Number of financial maintenance covenants \| agreement					1
Maximum Leverage Ratio may increase					0.5
Maximum
Debt Instrument
Leverage Ratio				4.75	5.0
Maximum Borrowing Capacity				$ 3,000	$ 3,000
Maximum \| Forecast
Debt Instrument
Leverage Ratio			4.50
Secured Credit Agreement
Debt Instrument
Unused Credit				$ 1,489	$ 1,489
Weighted average interest rate (as a percent)				1.58%	1.58%	1.58%
Secured Credit Agreement \| Minimum
Debt Instrument
Interest rate margin, Eurocurrency Rate loans (as a percent)				1.00%	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%	1.50%
Interest rate margin, Base Rate loans (as a percent)					0.50%
Revolving Loans
Debt Instrument
Total long-term debt									195
Term Loan A
Debt Instrument
Total long-term debt				$ 1,068	$ 1,068		1,067		1,157
Face Value				1,500	1,500
Increase in long term debt, net of debt issuance costs					1,068
Other secured debt
Debt Instrument
Total long-term debt							99		109
Debt redeemed		$ 105
Senior Notes
Debt Instrument
Additional interest charges for note repurchase premiums and write-off of unamortized finance fees		$ 38
Senior Notes 4.875%, due 2021 (330 million EUR)
Debt Instrument
Interest rate, stated percentage		4.875%
Debt redeemed		$ 130
Senior Notes 5.00%, due 2022
Debt Instrument
Interest rate, stated percentage	5.00%	5.00%
Debt redeemed	$ 81	$ 419
Additional interest charges for note repurchase premiums and write-off of unamortized finance fees	$ 6
Senior Notes 4.00%, due 2023
Debt Instrument
Total long-term debt				$ 308	$ 308		307		307
Interest rate, stated percentage				4.00%	4.00%	4.00%
Fair values of fixed rate debt obligations
Principal Amount				$ 310	$ 310
Indicated Market Price (in dollars per share) \| $ / shares				$ 102.57	$ 102.57
Fair Value				$ 318	$ 318
Senior Notes 5.875%, due 2023
Debt Instrument
Total long-term debt				$ 694	$ 694		692		691
Interest rate, stated percentage				5.875%	5.875%	5.875%
Fair values of fixed rate debt obligations
Principal Amount				$ 700	$ 700
Indicated Market Price (in dollars per share) \| $ / shares				$ 106.00	$ 106.00
Fair Value				$ 742	$ 742
Senior Notes 3.125%, due 2024 (725 million EUR)
Debt Instrument
Total long-term debt				$ 854	$ 854	€ 725	914	€ 725	873	€ 725
Interest rate, stated percentage				3.125%	3.125%	3.125%
Fair values of fixed rate debt obligations
Principal Amount				$ 841	$ 841
Indicated Market Price (in dollars per share) \| $ / shares				$ 103.53	$ 103.53
Fair Value				$ 871	$ 871
Senior Notes 6.375%, due 2025
Debt Instrument
Total long-term debt				$ 297	$ 297		296		296
Interest rate, stated percentage				6.375%	6.375%	6.375%
Fair values of fixed rate debt obligations
Principal Amount				$ 300	$ 300
Indicated Market Price (in dollars per share) \| $ / shares				$ 110.86	$ 110.86
Fair Value				$ 333	$ 333
Senior Notes, 5.375% due 2025
Debt Instrument
Total long-term debt				$ 298	$ 298		298		298
Interest rate, stated percentage				5.375%	5.375%	5.375%
Fair values of fixed rate debt obligations
Principal Amount				$ 300	$ 300
Indicated Market Price (in dollars per share) \| $ / shares				$ 107.11	$ 107.11
Fair Value				$ 321	$ 321
Senior Notes 2.875%, due 2025 (500 million EUR)
Debt Instrument
Total long-term debt				$ 574	$ 574	€ 500	607	€ 500	579	€ 500
Interest rate, stated percentage				2.875%	2.875%	2.875%
Fair values of fixed rate debt obligations
Principal Amount				$ 580	$ 580
Indicated Market Price (in dollars per share) \| $ / shares				$ 101.56	$ 101.56
Fair Value				$ 589	$ 589
Senior Notes 6.625%, due 2027
Debt Instrument
Total long-term debt		$ 700		$ 693	$ 693		692		691
Interest rate, stated percentage		6.625%		6.625%	6.625%	6.625%
Increase in long term debt, net of debt issuance costs		$ 690
Fair values of fixed rate debt obligations
Principal Amount				$ 700	$ 700
Indicated Market Price (in dollars per share) \| $ / shares				$ 107.40	$ 107.40
Fair Value				$ 752	$ 752
Finance leases
Debt Instrument
Total long-term debt				99	99		108		94
Other debt
Debt Instrument
Total long-term debt				5	5		$ 7		$ 6
Revolving Credit Facility
Debt Instrument
Total long-term debt				300	$ 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	$ 1,200