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Schedule of Long-Term Debt (Detail) € in Millions | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2014 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2017 EUR (€) | Mar. 31, 2017 USD ($) | Jun. 30, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 EUR (€) | Dec. 31, 2013 EUR (€)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Uncommitted credit facilities | $ 2,000,000 | $ 5,000,000 |  |  |  |  |  |  |  |
Other | 49,000,000 | 57,000,000 |  |  |  |  |  |  |  |
Total | 3,645,000,000 |  |  |  |  |  |  |  |  |
Less: Short-term debt and current portion of long-term debt | 26,000,000 | 279,000,000 |  |  |  |  |  |  |  |
Long-term debt | $ 3,573,000,000 | 3,244,000,000 |  |  |  |  |  |  |  |
Senior Notes [Member] | Floating Rate Senior Notes Due December 2017 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 2.75% |  |  |  |  |  |  |  |  |
Maturity Dates | December 2017 |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | $ 0 | $ 249,000,000 |  |  |  |  |  |  |  |
Percentage Of Margin Aggregate Interest Rate | 3.68% |  |  |  |  |  |  |  |  |
Senior Notes [Member] | 9 3/4% Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument interest percentage | 3.75% | 3.75% |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  |  |  |  |  |  | $ 223,000,000 |  |
Senior Notes [Member] | 6% Euro-Denominated Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument interest percentage | 6.00% | 6.00% |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | € |  |  |  |  |  |  |  |  | € 200 | € 250
Debt Instrument, Unamortized Premium |  |  | $ 1.0675 |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  | $ 275,000,000 |  |  | € 175 |  |  |  |  |
Maturity Dates | March 2021 |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | $ 0 | 194,000,000 |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  | $ 295,000,000 |  |  |  |  |  |  |
Percentage Of Margin Aggregate Interest Rate |  |  | 4.85% |  |  |  |  |  |  |
Debt Instrument, Repurchase Amount |  | $ 287,000,000 |  | $ 180,000,000 |  |  |  |  |  |
Senior Notes [Member] | Five and One over Eight Senior Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument interest percentage | 5.125% | 5.125% |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 400,000,000 |  |  |  |  |  |  |
Maturity Dates | June 2022 |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | $ 400,000,000 | $ 400,000,000 |  |  |  |  |  |  |  |
Senior Notes [Member] | 5 1/2% Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument interest percentage | 5.50% | 5.50% |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | 175,000,000 |  |  |  |  |  |  |
Maturity Dates | April 2023 |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | $ 675,000,000 | $ 675,000,000 |  |  |  |  |  |  |  |
Debt Instrument, Unamortized Discount |  |  | 0.99625 |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 300,000,000 |  |  |  |  |  |  |  |
Maturity Dates | November 2024 |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | $ 360,000,000 | $ 316,000,000 |  |  |  |  |  |  |  |
Senior Notes [Member] | Six And Three Over Eight Senior Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument interest percentage | 6.375% | 6.375% |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 350,000,000 |  |  |  |  |  |  |  |
Maturity Dates | April 2024 |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | $ 350,000,000 | $ 350,000,000 |  |  |  |  |  |  |  |
Senior Notes [Member] | Five And One Over Four Senior Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument interest percentage | 5.25% | 5.25% |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ 250,000,000 |  |  |  |  |  |  |  |  |
Maturity Dates | May 2025 |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | $ 300,000,000 | $ 0 |  |  |  |  |  |  |  |
Senior Notes [Member] | Eight And One Over Four Senior Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument interest percentage | 8.25% | 8.25% |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  | 292,000,000 |  |  |  |  |  |  |
Debt Instrument, Repurchase Amount |  |  | $ 395,000,000 |  |  |  |  |  |  |
Senior Notes [Member] | Four And Seven Over Eight Senior Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument interest percentage | 4.875% | 4.875% |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  | $ 300,000,000 |  |  |  |  |  |  |  |
Loans Payable [Member] | Floating Rate Term Loan Due March 2019 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 2.25% |  |  |  |  |  |  |  |
Maturity Dates | March 2019 |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | $ 0 | $ 144,000,000 |  |  |  |  | $ 970,000,000 |  |  |
Percentage Of Margin Aggregate Interest Rate |  | 3.25% |  |  |  |  |  |  |  |
Loans Payable [Member] | Floating Rate Term Loan Due March Two Thousand Twenty Two [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  | $ 1,100,000,000 |  |  |  |
Maturity Dates | March 2022 |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | $ 1,136,000,000 | $ 816,000,000 |  |  |  |  |  |  |  |
Percentage Of Margin Aggregate Interest Rate | 3.70% | 3.50% |  |  |  |  |  |  |  |
Senior Notes and Loans Payable [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Deferred Finance Costs, Net | $ (46,000,000) | $ (53,000,000) |  |  |  |  |  |  |  |
Total | $ 3,599,000,000 | 3,523,000,000 |  |  |  |  |  |  |  |
Interest Rate Swap [Member] | Senior Notes [Member] | Floating Rate Senior Notes Due December 2017 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, Fixed Interest Rate | 3.58% |  |  |  |  |  |  |  |  |
Interest Rate Swap [Member] | Loans Payable [Member] | Floating Rate Term Loan Due March Two Thousand Twenty Two [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, Amount of Hedged Item | $ 700,000,000 | $ 600,000,000 |  |  |  |  |  |  |  |
Derivative, Fixed Interest Rate | 3.79% | 4.21% |  |  |  |  |  |  |  |

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