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Long-Term Debt - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Jul. 31, 2017
Jun. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 06, 2012
Debt Instrument [Line Items]                
Pretax loss on retirement of debt     $ (25,000,000) $ (2,000,000) $ (39,000,000) $ (4,000,000) $ (135,000,000)  
Capital leases and other secured debt         599,000,000      
Maturity of long-term debt in 2019         2,284,000,000      
Maturity of long-term debt in 2020         4,177,000,000      
Maturity of long-term debt in 2021         1,078,000,000      
Maturity of long-term debt in 2022         3,449,000,000      
Interest Rate Swaps [Member]                
Debt Instrument [Line Items]                
Notional amount, total         $ 2,500,000,000      
Federal Fund Rate [Member]                
Debt Instrument [Line Items]                
Debt instrument basis spread         0.50%      
Minimum [Member]                
Debt Instrument [Line Items]                
Debt instrument, maturities range         2019      
Maximum [Member]                
Debt Instrument [Line Items]                
Debt instrument, maturities range         2022      
Asset-Based Revolving Credit Facility Maturing on June 28, 2022 [Member]                
Debt Instrument [Line Items]                
Credit facility, maximum amount   $ 3,750,000,000     $ 3,750,000,000      
Debt instrument maturity date   Jun. 28, 2022     Jun. 28, 2022      
Additional incremental credit facilities   $ 1,500,000,000            
Credit facility, commitment fee for unutilized commitments   0.25%            
Percentage of senior secured credit facility over eligible accounts receivable         85.00%      
Line of credit outstanding         $ 3,680,000,000      
Senior Secured Revolving Credit Facility Maturing On June 28, 2022 [Member]                
Debt Instrument [Line Items]                
Credit facility, maximum amount         $ 2,000,000,000      
Debt instrument maturity date         Jun. 28, 2022      
Line of credit outstanding         $ 0      
Senior Secured Term Loan A-5 Facility Maturing On June 10, 2020 [Member]                
Debt Instrument [Line Items]                
Credit facility, maximum amount         $ 1,225,000,000      
Debt instrument maturity date         Jun. 10, 2020      
Senior Secured Term Loan B-8 Facility Maturing On February 15, 2024 [Member]                
Debt Instrument [Line Items]                
Credit facility, maximum amount         $ 1,188,000,000      
Debt instrument maturity date         Feb. 15, 2024      
Senior Secured Term Loan B-9 Facility Maturing On March 18, 2023 [Member]                
Debt Instrument [Line Items]                
Credit facility, maximum amount         $ 1,478,000,000      
Debt instrument maturity date         Mar. 18, 2023      
4.25 Percentage First Lien Notes Due 2019 [Member]                
Debt Instrument [Line Items]                
Debt instrument, principal amount         $ 600,000,000      
Senior Unsecured Note Maturities Ranging 2022 to 2033 [Member]                
Debt Instrument [Line Items]                
Debt instrument, principal amount         $ 7,891,000,000      
Senior Unsecured Note Maturities Ranging 2022 to 2033 [Member] | Minimum [Member]                
Debt Instrument [Line Items]                
Debt instrument, maturities range         2022      
Senior Unsecured Note Maturities Ranging 2022 to 2033 [Member] | Maximum [Member]                
Debt Instrument [Line Items]                
Debt instrument, maturities range         2033      
Senior Unsecured Note Maturity Year 2025 [Member]                
Debt Instrument [Line Items]                
Debt instrument, principal amount         $ 125,000,000      
Senior Unsecured Note Maturities Ranging 2023 to 2095 [Member]                
Debt Instrument [Line Items]                
Debt instrument, principal amount         $ 736,000,000      
Senior Unsecured Note Maturities Ranging 2023 to 2095 [Member] | Minimum [Member]                
Debt Instrument [Line Items]                
Debt instrument, maturities range         2023      
Senior Unsecured Note Maturities Ranging 2023 to 2095 [Member] | Maximum [Member]                
Debt Instrument [Line Items]                
Debt instrument, maturities range         2095      
Senior Unsecured Notes Due 2021 [Member]                
Debt Instrument [Line Items]                
Debt instrument, principal amount         $ 1,000,000,000     $ 1,000,000,000
Debt instrument, stated interest               6.25%
Senior Notes [Member]                
Debt Instrument [Line Items]                
Debt instrument maturity date Oct. 31, 2018              
Senior Notes [Member] | Senior Secured Notes Due 2047 [Member]                
Debt Instrument [Line Items]                
Debt instrument, principal amount   $ 1,500,000,000     $ 1,500,000,000      
Debt instrument, stated interest   5.50%     5.50%      
Senior Notes [Member] | Senior Secured Notes Due 2018 [Member]                
Debt Instrument [Line Items]                
Debt instrument, stated interest 8.00%              
Proceeds from new term loan $ 500,000,000              
Pretax loss on retirement of debt $ 39,000,000              
Senior Notes [Member] | Senior Secured Notes Due 2020 [Member]                
Debt Instrument [Line Items]                
Debt instrument, principal amount         $ 3,000,000,000      
Debt instrument, stated interest         6.50%      
Senior Notes [Member] | Senior Secured Notes Due 2022 [Member]                
Debt Instrument [Line Items]                
Debt instrument, principal amount         $ 1,350,000,000      
Debt instrument, stated interest         5.875%      
Senior Notes [Member] | Senior Secured Notes Due 2023 [Member]                
Debt Instrument [Line Items]                
Debt instrument, principal amount         $ 1,250,000,000      
Debt instrument, stated interest         4.75%      
Senior Notes [Member] | Senior Secured Notes Due 2019 [Member]                
Debt Instrument [Line Items]                
Debt instrument, principal amount         $ 1,500,000,000      
Debt instrument, stated interest         3.75%      
Senior Notes [Member] | Senior Secured Notes Due 2024 [Member]                
Debt Instrument [Line Items]                
Debt instrument, principal amount         $ 2,000,000,000      
Debt instrument, stated interest         5.00%      
Senior Notes [Member] | 4.25 Percentage First Lien Notes Due 2019 [Member]                
Debt Instrument [Line Items]                
Debt instrument, stated interest         4.25%      
Senior Notes [Member] | Senior Secured Notes Due 2025 [Member]                
Debt Instrument [Line Items]                
Debt instrument, principal amount         $ 1,400,000,000      
Debt instrument, stated interest         5.25%      
Senior Notes [Member] | Senior Secured Notes Due 2026 [Member]                
Debt Instrument [Line Items]                
Debt instrument, principal amount         $ 1,500,000,000      
Debt instrument, stated interest         5.25%      
Senior Notes [Member] | Senior Secured Notes Due 2027 [Member]                
Debt Instrument [Line Items]                
Debt instrument, principal amount         $ 1,200,000,000      
Debt instrument, stated interest         4.50%