Long-Term Debt (Detail) - USD ($) | Jun. 30, 2020 | Apr. 30, 2020 | Apr. 02, 2020 | Dec. 31, 2019 |
Debt Instrument [Line Items] | | | | |
Credit Facility | $ 1,550,000,000 | | $ 4,500,000,000 | $ 0 |
Finance lease obligations | 155,000,000 | | | 157,000,000 |
Total debt | 11,798,000,000 | | | 10,940,000,000 |
Less current portion | (1,665,000,000) | | | (977,000,000) |
Long-term debt, noncurrent | 10,133,000,000 | | | 9,963,000,000 |
Series L Notes, interest rate of 3.3%, face amount of $173, maturing September 15, 2022 (effective interest rate of 3.4%) | | | | |
Debt Instrument [Line Items] | | | | |
Senior notes | 173,000,000 | | | 349,000,000 |
Series M Notes, interest rate of 3.4%, face amount of $350, maturing October 15, 2020 (effective interest rate of 3.6%) | | | | |
Debt Instrument [Line Items] | | | | |
Senior notes | 350,000,000 | | | 349,000,000 |
Series N Notes, interest rate of 3.1%, face amount of $400, maturing October 15, 2021 (effective interest rate of 3.4%) | | | | |
Debt Instrument [Line Items] | | | | |
Senior notes | 399,000,000 | | | 398,000,000 |
Series O Notes, interest rate of 2.9%, face amount of $450, maturing March 1, 2021 (effective interest rate of 3.1%) | | | | |
Debt Instrument [Line Items] | | | | |
Senior notes | 449,000,000 | | | 449,000,000 |
Series P Notes, interest rate of 3.8%, face amount of $350, maturing October 1, 2025 (effective interest rate of 4.0%) | | | | |
Debt Instrument [Line Items] | | | | |
Senior notes | 346,000,000 | | | 346,000,000 |
Series Q Notes, interest rate of 2.3%, face amount of $399, maturing January 15, 2022 (effective interest rate of 2.5%) | | | | |
Debt Instrument [Line Items] | | | | |
Senior notes | 398,000,000 | | | 747,000,000 |
Series R Notes, interest rate of 3.1%, face amount of $750, maturing June 15, 2026 (effective interest rate of 3.3%) | | | | |
Debt Instrument [Line Items] | | | | |
Senior notes | 745,000,000 | | | 744,000,000 |
Series U Notes, interest rate of 3.1%, face amount of $291, maturing February 15, 2023 (effective interest rate of 3.1%) | | | | |
Debt Instrument [Line Items] | | | | |
Senior notes | 291,000,000 | | | 291,000,000 |
Series V Notes, interest rate of 3.8%, face amount of $318, maturing March 15, 2025 (effective interest rate of 2.8%) | | | | |
Debt Instrument [Line Items] | | | | |
Senior notes | 331,000,000 | | | 332,000,000 |
Series W Notes, interest rate of 4.5%, face amount of $278, maturing October 1, 2034 (effective interest rate of 4.1%) | | | | |
Debt Instrument [Line Items] | | | | |
Senior notes | 291,000,000 | | | 291,000,000 |
Series X Notes, interest rate of 4.0%, face amount of $450, maturing April 15, 2028 (effective interest rate of 4.2%) | | | | |
Debt Instrument [Line Items] | | | | |
Senior notes | 444,000,000 | | | 444,000,000 |
Series Y Notes, floating rate, face amount of $550, maturing December 1, 2020 (effective interest rate of 1.0% at June 30, 2020) | | | | |
Debt Instrument [Line Items] | | | | |
Senior notes | 549,000,000 | | | 549,000,000 |
Series Z Notes, interest rate of 4.2%, face amount of $350, maturing December 1, 2023 (effective interest rate of 4.4%) | | | | |
Debt Instrument [Line Items] | | | | |
Senior notes | 348,000,000 | | | 347,000,000 |
Series AA Notes, interest rate of 4.7%, face amount of $300, maturing December 1, 2028 (effective interest rate of 4.8%) | | | | |
Debt Instrument [Line Items] | | | | |
Senior notes | 297,000,000 | | | 297,000,000 |
Series BB Notes, floating rate, face amount of $300, maturing March 8, 2021 (effective interest rate of 1.0% at June 30, 2020) | | | | |
Debt Instrument [Line Items] | | | | |
Senior notes | 299,000,000 | | | 299,000,000 |
Series CC Notes, interest rate of 3.6%, face amount of $550, maturing April 15, 2024 (effective interest rate of 3.9%) | | | | |
Debt Instrument [Line Items] | | | | |
Senior notes | 593,000,000 | | | 564,000,000 |
Series DD Notes, interest rate of 2.1%, face amount of $224, maturing October 3, 2022 (effective interest rate of 1.2%) | | | | |
Debt Instrument [Line Items] | | | | |
Senior notes | 229,000,000 | | | 543,000,000 |
Series EE Notes, interest rate of 5.8%, face amount of $1,600, maturing May 1, 2025 (effective interest rate of 6.0%) | | | | |
Debt Instrument [Line Items] | | | | |
Senior notes | 1,581,000,000 | | | 0 |
Series FF Notes, interest rate of 4.6%, face amount of $1,000, maturing June 15, 2030 (effective interest rate of 4.8%) | | | | |
Debt Instrument [Line Items] | | | | |
Senior notes | $ 985,000,000 | | | 0 |
Senior Notes | Series L Notes, interest rate of 3.3%, face amount of $173, maturing September 15, 2022 (effective interest rate of 3.4%) | | | | |
Debt Instrument [Line Items] | | | | |
Interest rate | 3.30% | | | |
Senior notes, face amount | $ 173,000,000 | | | |
Effective interest rate | 3.40% | | | |
Senior Notes | Series M Notes, interest rate of 3.4%, face amount of $350, maturing October 15, 2020 (effective interest rate of 3.6%) | | | | |
Debt Instrument [Line Items] | | | | |
Interest rate | 3.40% | | | |
Senior notes, face amount | $ 350,000,000 | | | |
Effective interest rate | 3.60% | | | |
Senior Notes | Series N Notes, interest rate of 3.1%, face amount of $400, maturing October 15, 2021 (effective interest rate of 3.4%) | | | | |
Debt Instrument [Line Items] | | | | |
Interest rate | 3.10% | | | |
Senior notes, face amount | $ 400,000,000 | | | |
Effective interest rate | 3.40% | | | |
Senior Notes | Series O Notes, interest rate of 2.9%, face amount of $450, maturing March 1, 2021 (effective interest rate of 3.1%) | | | | |
Debt Instrument [Line Items] | | | | |
Interest rate | 2.90% | | | |
Senior notes, face amount | $ 450,000,000 | | | |
Effective interest rate | 3.10% | | | |
Senior Notes | Series P Notes, interest rate of 3.8%, face amount of $350, maturing October 1, 2025 (effective interest rate of 4.0%) | | | | |
Debt Instrument [Line Items] | | | | |
Interest rate | 3.80% | | | |
Senior notes, face amount | $ 350,000,000 | | | |
Effective interest rate | 4.00% | | | |
Senior Notes | Series Q Notes, interest rate of 2.3%, face amount of $399, maturing January 15, 2022 (effective interest rate of 2.5%) | | | | |
Debt Instrument [Line Items] | | | | |
Interest rate | 2.30% | | | |
Senior notes, face amount | $ 399,000,000 | | | |
Effective interest rate | 2.50% | | | |
Senior Notes | Series R Notes, interest rate of 3.1%, face amount of $750, maturing June 15, 2026 (effective interest rate of 3.3%) | | | | |
Debt Instrument [Line Items] | | | | |
Interest rate | 3.10% | | | |
Senior notes, face amount | $ 750,000,000 | | | |
Effective interest rate | 3.30% | | | |
Senior Notes | Series U Notes, interest rate of 3.1%, face amount of $291, maturing February 15, 2023 (effective interest rate of 3.1%) | | | | |
Debt Instrument [Line Items] | | | | |
Interest rate | 3.10% | | | |
Senior notes, face amount | $ 291,000,000 | | | |
Effective interest rate | 3.10% | | | |
Senior Notes | Series V Notes, interest rate of 3.8%, face amount of $318, maturing March 15, 2025 (effective interest rate of 2.8%) | | | | |
Debt Instrument [Line Items] | | | | |
Interest rate | 3.80% | | | |
Senior notes, face amount | $ 318,000,000 | | | |
Effective interest rate | 2.80% | | | |
Senior Notes | Series W Notes, interest rate of 4.5%, face amount of $278, maturing October 1, 2034 (effective interest rate of 4.1%) | | | | |
Debt Instrument [Line Items] | | | | |
Interest rate | 4.50% | | | |
Senior notes, face amount | $ 278,000,000 | | | |
Effective interest rate | 4.10% | | | |
Senior Notes | Series X Notes, interest rate of 4.0%, face amount of $450, maturing April 15, 2028 (effective interest rate of 4.2%) | | | | |
Debt Instrument [Line Items] | | | | |
Interest rate | 4.00% | | | |
Senior notes, face amount | $ 450,000,000 | | | |
Effective interest rate | 4.20% | | | |
Senior Notes | Series Y Notes, floating rate, face amount of $550, maturing December 1, 2020 (effective interest rate of 1.0% at June 30, 2020) | | | | |
Debt Instrument [Line Items] | | | | |
Senior notes, face amount | $ 550,000,000 | | | |
Effective interest rate | 1.00% | | | |
Senior Notes | Series Z Notes, interest rate of 4.2%, face amount of $350, maturing December 1, 2023 (effective interest rate of 4.4%) | | | | |
Debt Instrument [Line Items] | | | | |
Interest rate | 4.20% | | | |
Senior notes, face amount | $ 350,000,000 | | | |
Effective interest rate | 4.40% | | | |
Senior Notes | Series AA Notes, interest rate of 4.7%, face amount of $300, maturing December 1, 2028 (effective interest rate of 4.8%) | | | | |
Debt Instrument [Line Items] | | | | |
Interest rate | 4.70% | | | |
Senior notes, face amount | $ 300,000,000 | | | |
Effective interest rate | 4.80% | | | |
Senior Notes | Series BB Notes, floating rate, face amount of $300, maturing March 8, 2021 (effective interest rate of 1.0% at June 30, 2020) | | | | |
Debt Instrument [Line Items] | | | | |
Senior notes, face amount | $ 300,000,000 | | | |
Effective interest rate | 1.00% | | | |
Senior Notes | Series CC Notes, interest rate of 3.6%, face amount of $550, maturing April 15, 2024 (effective interest rate of 3.9%) | | | | |
Debt Instrument [Line Items] | | | | |
Interest rate | 3.60% | | | |
Senior notes, face amount | $ 550,000,000 | | | |
Effective interest rate | 3.90% | | | |
Senior Notes | Series DD Notes, interest rate of 2.1%, face amount of $224, maturing October 3, 2022 (effective interest rate of 1.2%) | | | | |
Debt Instrument [Line Items] | | | | |
Interest rate | 2.10% | | | |
Senior notes, face amount | $ 224,000,000 | | | |
Effective interest rate | 1.20% | | | |
Senior Notes | Series EE Notes, interest rate of 5.8%, face amount of $1,600, maturing May 1, 2025 (effective interest rate of 6.0%) | | | | |
Debt Instrument [Line Items] | | | | |
Interest rate | 5.80% | 5.75% | | |
Senior notes, face amount | $ 1,600,000,000 | $ 1,600,000,000 | | |
Effective interest rate | 6.00% | | | |
Senior Notes | Series FF Notes, interest rate of 4.6%, face amount of $1,000, maturing June 15, 2030 (effective interest rate of 4.8%) | | | | |
Debt Instrument [Line Items] | | | | |
Interest rate | 4.625% | | | |
Senior notes, face amount | $ 1,000,000,000 | | | |
Effective interest rate | 4.80% | | | |
Commercial paper | | | | |
Debt Instrument [Line Items] | | | | |
Commercial paper | $ 817,000,000 | | | 3,197,000,000 |
Other | | | | |
Debt Instrument [Line Items] | | | | |
Other | $ 178,000,000 | | | $ 247,000,000 |