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External Debt and Financing Arrangements - Components of External Long-Term Debt (Parenthetical) (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Term Loan [Member]    
Debt Instrument [Line Items]    
Debt instrument face amount $ 525 $ 525
Debt instrument, maturity date 2019-03 2019-03
Notes due June 2020 [Member] | Senior Unsecured Notes [Member]    
Debt Instrument [Line Items]    
Debt instrument face amount $ 400 $ 400
Debt instrument, maturity date 2020-06 2020-06
Notes due June 2025 [Member] | Senior Unsecured Notes [Member]    
Debt Instrument [Line Items]    
Debt instrument face amount $ 500 $ 500
Debt instrument, maturity date 2025-06 2025-06
Notes due September 2023 [Member] | Senior Unsecured Notes [Member]    
Debt Instrument [Line Items]    
Debt instrument face amount $ 600 $ 600
Debt instrument, maturity date 2023-09 2023-09
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 1,250 $ 1,250
Revolving credit facility, expiration date 2021-06 2021-06