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Schedule of Long-Term Debt (Detail) € in Millions | 12 Months Ended |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2020 EUR (€) | Sep. 30, 2020 USD ($) | Aug. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 EUR (€) | Sep. 30, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 EUR (€) | Jun. 30, 2018 EUR (€) | Dec. 31, 2017 USD ($) | Dec. 31, 2014 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Other | $ 24,000,000 |  |  |  | $ 28,000,000 |  |  |  |  |  |  |
Total | 4,258,000,000 |  |  |  |  |  |  |  |  |  |  |
Short Term Debt And Current Portion Of Long Term Debt | 19,000,000 |  |  |  | 19,000,000 |  |  |  |  |  |  |
Less: Short-term debt and current portion of long-term debt |  |  |  |  | 19,000,000 |  |  |  |  |  |  |
Long-term debt | $ 4,191,000,000 |  |  |  | $ 3,416,000,000 |  |  |  |  |  |  |
Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maturity Dates | July 2027 |  |  |  |  |  |  |  |  |  |  |
Senior Notes [Member] | Floating Rate Senior Notes Due December 2017 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 2.75% |  |  |  |  |  |  |  |  |  |  |
Senior Notes [Member] | 9 3/4% Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  |  |  |  |  |  |  |  |  | $ 223,000,000 |
Senior Notes [Member] | 6% Euro-Denominated Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount | € |  |  |  |  |  |  |  |  | € 275 | € 175 |  |
Debt Instrument, Repurchase Amount | € |  |  |  |  |  |  |  |  |  | € 180 |  |
Senior Notes [Member] | Five and One over Eight Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest percentage | 5.125% | 5.125% |  |  | 5.125% | 5.125% |  |  |  |  |  |
Debt Instrument, Repurchase Amount | € |  | € 410 |  |  |  |  |  |  |  |  |  |
Senior Notes [Member] | 5 1/2% Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest percentage | 5.50% | 5.50% |  |  | 5.50% | 5.50% |  |  |  |  |  |
Debt Instrument, Face Amount | $ 200,000,000 |  |  | $ 100,000,000 | $ 475,000,000 |  | $ 400,000,000 |  |  |  |  | $ 175,000,000
Maturity Dates | April 2023 |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | $ 0 |  |  |  | $ 200,000,000 |  |  |  |  |  |  |
Debt Instrument, Repurchase Amount | $ 202,000,000 |  |  |  |  |  | $ 483,000,000 |  |  |  |  |
Debt Instrument, Unamortized Discount |  |  |  |  |  |  |  |  |  |  |  | $ 0.99625
Senior Notes [Member] | Six And Three Over Eight Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest percentage | 6.375% | 6.375% |  |  | 6.375% | 6.375% |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  |  |  |  |  |  | $ 350,000,000 |  |  |  |
Maturity Dates | April 2024 |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | $ 350,000,000 |  |  |  | $ 350,000,000 |  |  |  |  |  |  |
Senior Notes [Member] | Four and One over Eight Euro-Denominated Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest percentage | 4.125% | 4.125% |  |  | 4.125% | 4.125% |  |  |  |  |  |
Debt Instrument, Face Amount | € |  |  |  |  |  |  |  |  | € 300 |  |  |
Maturity Dates | November 2024 |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | $ 366,000,000 |  |  |  | $ 336,000,000 |  |  |  |  |  |  |
Senior Notes [Member] | Five And One Over Four Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest percentage | 5.25% | 5.25% |  |  | 5.25% | 5.25% |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  | $ 375,000,000 |
Maturity Dates | March 2025 |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | $ 375,000,000 |  |  |  | $ 375,000,000 |  |  |  |  |  |  |
Senior Notes [Member] | Four and One over Two Euro-Denominated Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest percentage | 4.50% | 4.50% |  |  | 4.50% | 4.50% |  |  |  |  |  |
Debt Instrument, Face Amount | € |  |  |  |  |  | € 250 |  |  |  |  |  |
Maturity Dates | May 2025 |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | $ 305,000,000 |  |  |  | $ 280,000,000 |  |  |  |  |  |  |
Senior Notes [Member] | Four and three over four Euro-Denominated Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest percentage | 4.75% | 4.75% |  |  | 4.75% | 4.75% |  |  |  |  |  |
Debt Instrument, Face Amount | € |  | € 350 |  |  |  |  |  |  |  |  |  |
Maturity Dates | January 2026 |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | $ 428,000,000 |  |  |  | $ 393,000,000 |  |  |  |  |  |  |
Senior Notes [Member] | Four And Seven Over Eight Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  |  |  |  |  |  | $ 300,000,000 |  |  |  |
Senior Notes [Member] | Five and Three over Four Senior Note [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 350,000,000 |  | 400,000,000 |  |  |  |  |  |  |
Long-term Debt, Gross | $ 724,000,000 |  |  |  | 400,000,000 |  |  |  |  |  |  |
Senior Notes [Member] | Ten and One over Two Senior Secured Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maturity Dates | May 2025 |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | $ 487,000,000 |  |  |  | 0 |  |  |  |  |  |  |
Loans Payable [Member] | Floating Rate Term Loan Due March 2019 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 2.25% |  |  |  |  |  |  |  |  |  |  |
Loans Payable [Member] | Floating Rate Term Loan Due March Two Thousand Twenty Five [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ 1,200,000,000 |  |  |  |  |  |  |  |  |  |  |
Derivative, Fixed Interest Rate | 2.25% | 2.25% |  |  |  |  |  |  |  |  |  |
Maturity Dates | August 2027 |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | $ 1,199,000,000 |  |  |  | 1,112,000,000 |  |  |  |  |  |  |
Percentage Of Margin Aggregate Interest Rate | 2.40% |  |  |  |  |  |  |  |  |  |  |
Senior Notes and Loans Payable [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Deferred Finance Costs, Net | $ (48,000,000) |  |  |  | (39,000,000) |  |  |  |  |  |  |
Total | 4,210,000,000 |  |  |  | $ 3,435,000,000 |  |  |  |  |  |  |
Interest Rate Swap [Member] | Loans Payable [Member] | Floating Rate Term Loan Due March Two Thousand Twenty Five [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Amount of Hedged Item | $ 700,000,000 |  |  |  |  |  |  |  |  |  |  |
Derivative, Fixed Interest Rate | 4.58% | 4.58% |  |  |  |  |  |  |  |  |  |

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