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Long-Term Debt - Additional Information (Detail) - USD ($) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Feb. 29, 2020
Debt Instrument [Line Items] |  |  |  |  |
Pretax loss on retirement of debt |  | $ 295,000,000 | $ 211,000,000 | $ 9,000,000 |
Capital leases and other secured debt |  | 767,000,000 |  |  |
Maturity of long-term debt in 2022 |  | 233,000,000 |  |  |
Maturity of long-term debt in 2023 |  | 2,799,000,000 |  |  |
Maturity of long-term debt in 2024 |  | 3,163,000,000 |  |  |
Maturity of long-term debt in 2025 |  | $ 5,872,000,000 |  |  |
Minimum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, maturities range |  | 2022 |  |  |
Maximum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, maturities range |  | 2025 |  |  |
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% |  |  |
Asset-Based Revolving Credit Facility Maturing on June 28, 2022 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing capacity |  | $ 3,750,000,000 |  |  |
Debt instrument maturity date |  | Jun. 28, 2022 |  |  |
Percentage of senior secured credit facility over eligible accounts receivable |  | 85.00% |  |  |
Line of credit outstanding |  | $ 0 |  |  |
Senior Secured Revolving Credit Facility Maturing On June 28, 2022 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing capacity |  | $ 2,000,000,000.000 |  |  |
Debt instrument maturity date |  | Jun. 28, 2022 |  |  |
Line of credit outstanding |  | $ 0 |  |  |
Senior Secured Term Loan A-6 Facility Maturing On July 16, 2024 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing capacity |  | $ 1,078,000,000.000 |  |  |
Debt instrument maturity date |  | Jul. 16, 2024 |  |  |
Senior Secured Term Loan B-12 Facility Maturing On March 13, 2025 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing capacity |  | $ 1,459,000,000 |  |  |
Debt instrument maturity date |  | Mar. 13, 2025 |  |  |
Senior Secured Term Loan B-13 Facility Maturing On March 18, 2026 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing capacity |  | $ 1,134,000,000 |  |  |
Debt instrument maturity date |  | Mar. 18, 2026 |  |  |
Senior Secured Revolving Credit Facility Maturing On March 19, 2021 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing capacity |  | $ 2,000,000,000.000 |  |  |
Debt instrument maturity date |  | Mar. 18, 2021 |  |  |
Line of credit outstanding |  | $ 0 |  |  |
Senior Unsecured Note Maturities Ranging 2021 to 2033 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, principal amount |  | $ 12,091,000,000.000 |  |  |
Senior Unsecured Note Maturities Ranging 2021 to 2033 [Member] | Minimum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, maturities range |  | 2023 |  |  |
Senior Unsecured Note Maturities Ranging 2021 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 |  |  |
Secured Debt [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Pretax loss on retirement of debt |  | $ 295,000,000 |  |  |
6.25% Senior Notes Due 2021 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Early Repayment of Senior Debt | $ 1,000,000,000.000 |  |  |  |
Debt Instrument, Redemption Price, Percentage | 6.25% |  |  |  |
7.50% Senior Notes Due 2022 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Early Repayment of Senior Debt | $ 2,000,000,000.000 |  |  |  |
Debt Instrument, Redemption Price, Percentage | 7.50% |  |  |  |
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 2024 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, principal amount |  | $ 2,000,000,000.000 |  |  |
Debt instrument, stated interest |  | 5.00% |  |  |
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% |  |  |
Senior Notes [Member] | Senior Secured Notes Due 2029 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, principal amount |  | $ 2,000,000,000.000 |  |  |
Debt instrument, stated interest |  | 4.125% |  |  |
Senior Notes [Member] | Senior Secured Notes Due 2047 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, principal amount |  | $ 1,500,000,000 |  |  |
Debt instrument, stated interest |  | 5.50% |  |  |
Senior Notes [Member] | Senior Secured Notes Due 2049 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, principal amount |  | $ 2,000,000,000.000 |  |  |
Debt instrument, stated interest |  | 5.25% |  |  |
Senior Notes [Member] | 5.13% Senior Notes Due 2039 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, principal amount |  | $ 1,000,000,000.000 |  |  |
Senior Unsecured Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, principal amount |  |  |  |  | $ 2,700,000,000
Debt instrument, stated interest |  |  |  |  | 3.50%
Senior Secured Three Six Four Day Term Loan Facility [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing capacity |  | $ 2,000,000,000.000 |  |  |

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