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Borrowings and Credit Arrangements - Schedule of Debt (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Aug. 31, 2020 | Dec. 31, 2019 | Aug. 31, 2019 | Aug. 15, 2019
--- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt | $ 64,235 |  |  |  |
Finance lease liabilities | 1,083 |  | $ 808 |  |
Total debt principal | 65,318 |  | 69,246 |  |
Debt premiums | 238 |  | 262 |  |
Debt discounts and deferred financing costs | (909) |  | (1,028) |  |
Long-term debt and lease obligations | 64,647 |  | 68,480 |  |
Current portion of long-term debt | (5,440) |  | (3,781) |  |
Long-term debt | $ 59,207 |  | 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 | $ 2,336 |  | 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 | $ 414 |  | 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% |  |  |  | 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 | $ 950 |  | 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% |  |  |  | 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% |  |  |  |
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% |  |  |  |
Long-term debt | $ 2,250 |  | 0 |  |
Senior Notes | 4.3% senior notes due March 2028 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt interest rate | 4.30% |  |  |  |
Long-term debt | $ 7,050 |  | 9,000 |  |
Senior Notes | 3.25% senior notes due August 2029 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt interest rate | 3.25% |  |  |  | 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% |  |  |  |
Long-term debt | $ 1,500 |  | 0 |  |
Senior Notes | 1.75% senior notes due August 2030 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt interest rate | 1.75% |  |  |  |
Long-term debt | $ 1,250 |  | 0 |  |
Senior Notes | 1.875% senior notes due February 2031 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt interest rate | 1.875% |  |  |  |
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% |  |  |  |
Long-term debt | $ 1,000 |  | 0 |  |
Senior Notes | 2.7% senior notes due August 2040 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt interest rate | 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% |  |  |  |
Long-term debt | $ 750 |  | $ 0 |  |
Notes Payable | Floating rate notes due March 2020 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt interest rate |  |  | 2.515% |  |
Long-term debt | $ 0 |  | $ 277 |  |
Notes Payable | Floating rate notes due March 2021 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt interest rate | 0.95% |  | 2.605% |  |
Long-term debt | $ 1,000 |  | $ 1,000 |  |
Other Debt Obligations |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt | $ 326 |  | $ 279 |  |

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