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Financing - Summary of Debt (Detail) - USD ($)
Sep. 30, 2019
Apr. 04, 2019
Feb. 19, 2019
Dec. 31, 2018
Debt Instrument [Line Items]        
Total principal amount of debt $ 10,300,000,000.0     $ 4,036,300,000
Less: Original issue discount, net of amortization (30,200,000)     (1,500,000)
Less: Debt issuance costs, net of amortization (136,600,000)     (48,900,000)
Less: Current portion (32,000,000.0)      
Long-term debt 10,101,200,000     3,985,900,000
5.00% Senior Notes Due March 2027 [Member]        
Debt Instrument [Line Items]        
Senior notes 750,000,000.0     750,000,000.0
8.25% Senior Notes Due 2027 [Member]        
Debt Instrument [Line Items]        
Senior notes 1,000,000,000.0   $ 1,000,000,000.0  
6.00% Senior Notes Due June 2025 [Member]        
Debt Instrument [Line Items]        
Senior notes 1,500,000,000.0     1,500,000,000.0
5.50% Senior Notes Due June 2024 [Member]        
Debt Instrument [Line Items]        
Senior notes 650,000,000.0     650,000,000.0
5.00% Senior Notes Due June 2021 [Member]        
Debt Instrument [Line Items]        
Senior notes 450,000,000.0     650,000,000.0
6.00% Senior Secured Notes Due 2026 [Member]        
Debt Instrument [Line Items]        
Senior secured notes 1,500,000,000.0   1,500,000,000  
5.50% Senior Secured Notes Due 2024 [Member]        
Debt Instrument [Line Items]        
Senior secured notes 1,250,000,000.0   $ 1,250,000,000  
Senior Secured Term Loan Due April 2026 [Member]        
Debt Instrument [Line Items]        
Senior secured notes 3,200,000,000.0 $ 3,200,000,000    
Less: Current portion $ (32,000,000.0)      
Senior Secured Term Loan Due December 2022 [Member]        
Debt Instrument [Line Items]        
Senior secured notes       $ 486,300,000