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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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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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