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v3.20.2

Borrowings - Schedule of Borrowings (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Aug. 31, 2020 | Aug. 21, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Aug. 31, 2019
--- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |
Finance lease obligations | $ 1,036 |  |  |  | $ 808 |
Total debt principal | 67,721 |  |  |  | 69,246 |
Debt premiums | 245 |  |  |  | 262 |
Debt discounts and deferred financing costs | (971) |  |  |  | (1,028) |
Long-term debt and lease obligation | 66,995 |  |  |  | 68,480 |
Current portion of long-term debt | (5,443) |  |  |  | (3,781) |
Long-term debt | 61,552 |  |  |  | $ 64,699 |
Senior Notes | 3.125% senior notes due March 2020 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate |  |  |  |  | 3.125% | 3.125%
Long-term debt | 0 |  |  |  | $ 723 |
Senior Notes | 2.8% senior notes due July 2020 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate |  |  |  |  | 2.80% |
Long-term debt | $ 0 |  |  |  | $ 2,750 |
Senior Notes | 3.35% senior notes due March 2021 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate | 3.35% |  |  |  |  | 3.35%
Long-term debt | $ 2,038 |  |  |  | 2,038 |
Senior Notes | 4.125% senior notes due May 2021 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate | 4.125% |  |  |  |  | 4.125%
Long-term debt | $ 222 |  |  |  | 222 |
Senior Notes | 2.125% senior notes due June 2021 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate | 2.125% |  |  |  |  |
Long-term debt | $ 1,750 |  |  |  | 1,750 |
Senior Notes | 4.125% senior notes due June 2021 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate | 4.125% |  |  |  |  | 4.125%
Long-term debt | $ 203 |  |  |  | 203 |
Senior Notes | 5.45% senior notes due June 2021 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate | 5.45% |  |  |  |  | 5.45%
Long-term debt | $ 187 |  |  |  | 187 |
Senior Notes | 3.5% senior notes due July 2022 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate | 3.50% |  |  |  |  |
Long-term debt | $ 1,500 |  |  |  | 1,500 |
Senior Notes | 2.75% senior notes due November 2022 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate | 2.75% |  |  |  |  |
Long-term debt | $ 1,000 |  |  |  | 1,000 |
Senior Notes | 2.75% senior notes due December 2022 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate | 2.75% |  |  |  |  |
Long-term debt | $ 1,250 |  |  |  | 1,250 |
Senior Notes | 4.75% senior notes due December 2022 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate | 4.75% |  |  |  |  |
Long-term debt | $ 399 |  |  |  | 399 |
Senior Notes | 3.7% senior notes due March 2023 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate | 3.70% | 3.70% |  |  |  |
Long-term debt | $ 3,723 |  |  |  | 6,000 |
Senior Notes | 2.8% senior notes due June 2023 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate | 2.80% |  |  |  |  |
Long-term debt | $ 1,300 |  |  |  | 1,300 |
Senior Notes | 4% senior notes due December 2023 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate | 4.00% | 4.00% |  |  |  |
Long-term debt | $ 527 |  |  |  | 1,250 |
Senior Notes | 3.375% senior notes due August 2024 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate | 3.375% |  |  |  |  |
Long-term debt | $ 650 |  |  |  | 650 |
Senior Notes | 2.625% senior notes due August 2024 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate | 2.625% |  |  |  |  |
Long-term debt | $ 1,000 |  |  |  | 1,000 |
Senior Notes | 3.5% senior notes due November 2024 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate | 3.50% |  |  |  |  |
Long-term debt | $ 750 |  |  |  | 750 |
Senior Notes | 5% senior notes due December 2024 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate | 5.00% |  |  |  |  |
Long-term debt | $ 299 |  |  |  | 299 |
Senior Notes | 4.1% senior notes due March 2025 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate | 4.10% | 4.10% |  |  |  |
Long-term debt | $ 2,000 |  |  |  | 5,000 |
Senior Notes | 3.875% senior notes due July 2025 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate | 3.875% |  |  |  |  |
Long-term debt | $ 2,828 |  |  |  | 2,828 |
Senior Notes | 2.875% senior notes due June 2026 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate | 2.875% |  |  |  |  |
Long-term debt | $ 1,750 |  |  |  | 1,750 |
Senior Notes | 3% senior notes due August 2026 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate | 3.00% |  |  |  |  |
Long-term debt | $ 750 |  |  |  | 750 |
Senior Notes | 3.625% senior notes due April 2027 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate | 3.625% |  |  | 3.625% |  |
Long-term debt | $ 750 |  |  |  | 0 |
Senior Notes | 6.25% senior notes due June 2027 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate | 6.25% |  |  |  |  |
Long-term debt | $ 372 |  |  |  | 372 |
Senior Notes | 1.3% senior notes due August 2027 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate | 1.30% |  | 1.30% |  |  |
Long-term debt | $ 1,500 |  |  |  | 0 |
Senior Notes | 4.3% senior notes due March 2028 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate | 4.30% |  |  |  |  |
Long-term debt | $ 9,000 |  |  |  | 9,000 |
Senior Notes | 3.25% senior notes due August 2029 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate | 3.25% |  |  |  |  |
Long-term debt | $ 1,750 |  |  |  | 1,750 |
Senior Notes | 3.75% senior notes due April 2030 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate | 3.75% |  |  | 3.75% |  |
Long-term debt | $ 1,500 |  |  |  | 0 |
Senior Notes | 1.75% senior notes due August 2030 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate | 1.75% |  | 1.75% |  |  |
Long-term debt | $ 1,250 |  |  |  | 0 |
Senior Notes | 4.875% senior notes due July 2035 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate | 4.875% |  |  |  |  |
Long-term debt | $ 652 |  |  |  | 652 |
Senior Notes | 6.625% senior notes due June 2036 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate | 6.625% |  |  |  |  |
Long-term debt | $ 771 |  |  |  | 771 |
Senior Notes | 6.75% senior notes due December 2037 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate | 6.75% |  |  |  |  |
Long-term debt | $ 533 |  |  |  | 533 |
Senior Notes | 4.78% senior notes due March 2038 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate | 4.78% |  |  |  |  |
Long-term debt | $ 5,000 |  |  |  | 5,000 |
Senior Notes | 6.125% senior notes due September 2039 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate | 6.125% |  |  |  |  |
Long-term debt | $ 447 |  |  |  | 447 |
Senior Notes | 4.125% senior notes due April 2040 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate | 4.125% |  |  | 4.125% |  |
Long-term debt | $ 1,000 |  |  |  | 0 |
Senior Notes | 2.7% senior notes due August 2040 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate | 2.70% |  | 2.70% |  |  |
Long-term debt | $ 1,250 |  |  |  | 0 |
Senior Notes | 5.75% senior notes due May 2041 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate | 5.75% |  |  |  |  |
Long-term debt | $ 133 |  |  |  | 133 |
Senior Notes | 4.5% senior notes due May 2042 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate | 4.50% |  |  |  |  |
Long-term debt | $ 500 |  |  |  | 500 |
Senior Notes | 4.125% senior notes due November 2042 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate | 4.125% |  |  |  |  |
Long-term debt | $ 500 |  |  |  | 500 |
Senior Notes | 5.3% senior notes due December 2043 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate | 5.30% |  |  |  |  |
Long-term debt | $ 750 |  |  |  | 750 |
Senior Notes | 4.75% senior notes due March 2044 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate | 4.75% |  |  |  |  |
Long-term debt | $ 375 |  |  |  | 375 |
Senior Notes | 5.125% senior notes due July 2045 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate | 5.125% |  |  |  |  |
Long-term debt | $ 3,500 |  |  |  | 3,500 |
Senior Notes | 3.875% senior notes due August 2047 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate | 3.875% |  |  |  |  |
Long-term debt | $ 1,000 |  |  |  | 1,000 |
Senior Notes | 5.05% senior notes due March 2048 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate | 5.05% |  |  |  |  |
Long-term debt | $ 8,000 |  |  |  | 8,000 |
Senior Notes | 4.25% senior notes due April 2050 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate | 4.25% |  |  | 4.25% |  |
Long-term debt | $ 750 |  |  |  | $ 0 |
Floating Rate Notes | Floating rate notes due March 2020 (2.515% at December 31, 2019) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate |  |  |  |  | 2.515% |
Long-term debt | $ 0 |  |  |  | $ 277 |
Floating Rate Notes | Floating rate notes due March 2021 (0.968% at September 30, 2020 and 2.605% at December 31, 2019) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate | 0.968% |  |  |  | 2.605% |
Long-term debt | $ 1,000 |  |  |  | $ 1,000 |
Other Debt Obligations |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | $ 276 |  |  |  | $ 279 |

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