Debt (Details) $ / shares in Units, € in Millions, $ in Millions	1 Months Ended			3 Months Ended
	Dec. 31, 2017 USD ($)	Nov. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Mar. 31, 2018 EUR (€) item	Mar. 31, 2018 USD ($) $ / shares	Dec. 31, 2017 EUR (€)	Dec. 31, 2017 USD ($)	Mar. 31, 2017 EUR (€)	Mar. 31, 2017 USD ($)
Debt Instrument
Total long-term debt					$ 5,651		$ 5,132		$ 5,455
Less amounts due within one year					11		11		24
Long-term debt					5,640		5,121		5,431
Accounts receivable securitization
Short-term loans and long-term debt due within one year					$ 194		162		196
Amended Agreement
Debt Instrument
Leverage ratio, Q1				4.00%	4.00%
Unused Credit					$ 412
Number financial maintenance covenants | item				1
Accounts receivable securitization
Weighted average interest rate, short-term debt (as a percent)				2.98%	2.98%
Revolving Loans
Debt Instrument
Total long-term debt					$ 462				285
Term Loan A
Debt Instrument
Total long-term debt					1,149		1,148		1,370
Term Loan A | Amended Agreement
Debt Instrument
Face Value					1,575
Term Loan A (279 million EUR at March 31, 2017)
Debt Instrument
Total long-term debt								€ 279	284
Senior Notes 6.75%, due 2020 (500 million EUR)
Debt Instrument
Total long-term debt				€ 500	$ 613	€ 500	594	500	530
Interest rate, stated percentage				6.75%	6.75%
Fair values of fixed rate debt obligations
Principal Amount					$ 616
Indicated Market Price (in dollars per share) | $ / shares					$ 114.41
Fair Value					$ 704
Senior Notes 4.875%, due 2021 (330 million EUR)
Debt Instrument
Total long-term debt				€ 330	$ 404	€ 330	392	€ 330	350
Interest rate, stated percentage				4.875%	4.875%
Fair values of fixed rate debt obligations
Principal Amount					$ 406
Indicated Market Price (in dollars per share) | $ / shares					$ 110.78
Fair Value					$ 450
Senior Notes 5.00%, due 2022
Debt Instrument
Total long-term debt					$ 496		496		495
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					$ 101.50
Fair Value					$ 508
Senior Notes 4.00%, due 2023
Debt Instrument
Total long-term debt					$ 305		$ 305
Interest rate, stated percentage				4.00%	4.00%	4.00%	4.00%
Face Value							$ 310
Net proceeds, after deducting debt issuance costs	$ 305
Fair values of fixed rate debt obligations
Principal Amount					$ 310
Indicated Market Price (in dollars per share) | $ / shares					$ 95.53
Fair Value					$ 296
Senior Notes 5.875%, due 2023
Debt Instrument
Total long-term debt					$ 686		685		683
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					$ 103.89
Fair Value					$ 727
Senior Notes 3.125%, due 2024 (725 million EUR at March 31, 2018)
Debt Instrument
Total long-term debt				€ 725	$ 872		$ 849		$ 763
Interest rate, stated percentage				3.125%	3.125%	3.125%	3.125%	3.125%	3.125%
Face Value | €								€ 225
Net proceeds, after deducting debt issuance costs			$ 237
Fair values of fixed rate debt obligations
Principal Amount					$ 893
Indicated Market Price (in dollars per share) | $ / shares					$ 101.91
Fair Value					$ 910
Senior Notes, 5.375% due 2025
Debt Instrument
Total long-term debt					$ 297		$ 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					$ 101.40
Fair Value					$ 304
Senior Notes 6.375%, due 2025
Debt Instrument
Total long-term debt					$ 295		295		294
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					$ 107.60
Fair Value					$ 323
Senior Debentures 7.80%, due 2018
Debt Instrument
Total long-term debt									22
Interest rate, stated percentage				7.80%	7.80%
Face Value									228
Fair values of fixed rate debt obligations
Interest charges for note repurchase premiums and related write-off of unamortized finance fees		$ 18
Capital leases
Debt Instrument
Total long-term debt					$ 53		54		56
Other debt
Debt Instrument
Total long-term debt					19		17		26
Revolving Credit Facility | Amended Agreement
Debt Instrument
Total long-term debt					300
Multicurrency Revolving Credit Facility | Amended Agreement
Debt Instrument
Total long-term debt					600
Accounts Receivable Securitization Program
Accounts receivable securitization
Short-term loans and long-term debt due within one year					$ 144		$ 133		$ 148
Weighted average interest rate, short-term debt (as a percent)				1.01%	1.01%	0.76%	0.76%	0.88%	0.88%
European Accounts Receivable Securitization Program
Accounts receivable securitization
Maximum Borrowing Capacity | €				€ 185
Minimum | Secured Credit Agreement
Debt Instrument
Interest rate margin, Eurocurrency Rate loans (as a percent)				1.25%	1.25%
Interest rate margin, Base Rate loans (as a percent)				0.25%
Minimum | Revolving Credit Facility
Debt Instrument
Facility fee payable (as a percent)				0.20%
Maximum | Secured Credit Agreement
Debt Instrument
Interest rate margin, Eurocurrency Rate loans (as a percent)				1.75%	1.75%
Interest rate margin, Base Rate loans (as a percent)				0.75%
Maximum | Revolving Credit Facility
Debt Instrument
Facility fee payable (as a percent)				0.30%