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Debt - Estimated Fair Values of Senior Debt Issues (Details) € in Millions, $ in Millions	Dec. 31, 2019 USD ($)	Dec. 31, 2019 EUR (€)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 EUR (€)
Debt Instrument [Line Items]
Less: Unamortized issue discounts	$ (8)		$ (10)
Less: Unamortized debt issuance costs	(28)		(35)
Senior Secured Tranche B-2 U.S Dollar Term Loan Due May 2025 [Member]
Debt Instrument [Line Items]
Long-term debt, Carrying Value	884		893
Senior Secured Tranche B-2 Euro Term Loan Due May 2025 [Member]
Debt Instrument [Line Items]
Long-term debt, Carrying Value	383	€ 344	396	€ 347
Securitization Facility [Member]
Debt Instrument [Line Items]
Short-term debt, Carrying Value	110
6.625% Senior Unsecured Notes Due May 2023 [Member]
Debt Instrument [Line Items]
Long-term debt, Carrying Value	908		908
7.000% Senior Unsecured Notes Due May 2025 [Member]
Debt Instrument [Line Items]
Long-term debt, Carrying Value	750		750
4.000% Senior Unsecured Notes Due May 2026 [Member]
Debt Instrument [Line Items]
Long-term debt, Carrying Value	501	€ 450	513	€ 450
5.375% Senior Unsecured Notes Due May 2027 [Member]
Debt Instrument [Line Items]
Long-term debt, Carrying Value	500		500
Level 2 [Member]
Debt Instrument [Line Items]
Total senior debt, Fair Value	3,930		3,876
Total senior debt, Carrying Value	4,036		3,960
Less: Unamortized issue discounts	(8)		(10)
Less: Unamortized debt issuance costs	(28)		(35)
Total senior debt, net	4,000		3,915
Level 2 [Member] | Senior Secured Tranche B-2 U.S Dollar Term Loan Due May 2025 [Member]
Debt Instrument [Line Items]
Long-term debt, Carrying Value	884		893
Long-term debt, Fair Value	865		862
Level 2 [Member] | Senior Secured Tranche B-2 Euro Term Loan Due May 2025 [Member]
Debt Instrument [Line Items]
Long-term debt, Carrying Value	383		396
Long-term debt, Fair Value	378		394
Level 2 [Member] | 6.625% Senior Unsecured Notes Due May 2023 [Member]
Debt Instrument [Line Items]
Long-term debt, Carrying Value	908		908
Long-term debt, Fair Value	917		918
Level 2 [Member] | 7.000% Senior Unsecured Notes Due May 2025 [Member]
Debt Instrument [Line Items]
Long-term debt, Carrying Value	750		750
Long-term debt, Fair Value	755		761
Level 2 [Member] | 4.000% Senior Unsecured Notes Due May 2026 [Member]
Debt Instrument [Line Items]
Long-term debt, Carrying Value	501		513
Long-term debt, Fair Value	455		487
Level 2 [Member] | 5.375% Senior Unsecured Notes Due May 2027 [Member]
Debt Instrument [Line Items]
Long-term debt, Carrying Value	500		500
Long-term debt, Fair Value	$ 450		$ 454

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