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Borrowings and Credit Arrangements - Schedule of Debt (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Nov. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2019 | Aug. 31, 2019 | Aug. 15, 2019 | Jan. 01, 2019
Debt Instrument [Line Items] |  |  |  |  |  |
Short-term debt |  | $ 720 | $ 0 |  |  |
Long-term debt |  |  | 68,438 |  |  |
Finance lease liabilities |  |  | 808 |  |  |
Finance lease liabilities |  | 642 |  |  |  |
Total debt principal |  | 74,265 | 69,246 |  |  |
Debt premiums |  | 302 | 262 |  |  |
Debt discounts and deferred financing costs |  | (1,138) | (1,028) |  |  |
Long-term debt, short term debt, and lease obligation |  | 73,429 | 68,480 |  |  |
Short-term debt (commercial paper) |  | (720) | 0 |  |  |
Current portion of long-term debt |  | (1,265) | (3,781) |  |  | $ (1,267)
Long-term debt |  | $ 71,444 | 64,699 |  |  |
Senior Notes | 2.2% senior notes due March 2019 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate |  | 2.20% |  |  |  |
Long-term debt |  | $ 375 | 0 |  |  |
Senior Notes | 2.25% senior notes due August 2019 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate |  | 2.25% |  |  |  |
Long-term debt |  | $ 850 | $ 0 |  |  |
Senior Notes | 3.125% senior notes due March 2020 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate |  |  | 3.125% | 3.125% |  |
Long-term debt |  | 2,000 | $ 723 |  |  |
Senior Notes | 2.8% senior notes due July 2020 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate |  |  | 2.80% |  |  |
Long-term debt |  | 2,750 | $ 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 |  | 3,000 | $ 2,038 |  |  |
Senior Notes | 4.125% senior notes due May 2021 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate |  |  | 4.125% |  |  |
Long-term debt |  | 550 | $ 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% |  |  |
Long-term debt |  | 500 | $ 203 |  |  |
Senior Notes | 5.45% senior notes due June 2021 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate |  |  | 5.45% | 5.45% |  |
Long-term debt |  | 600 | $ 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% |  |  |
Long-term debt |  | 6,000 | $ 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% |  |  |
Long-term debt |  | 1,250 | $ 1,250 |  |  |
Senior Notes | 2.625% senior notes due August 2024 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate |  |  | 2.265% |  | 2.625% |
Long-term debt |  | 0 | $ 1,000 |  |  |
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 | 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% |  |  |
Long-term debt |  | 5,000 | $ 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% |  | 3.00% |
Long-term debt |  | 0 | $ 750 |  |  |
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 | 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% |  | 3.25% |
Long-term debt |  | 0 | $ 1,750 |  |  |
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 | 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 |  |  |
Notes Payable | Floating rate notes due March 2020 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate |  | 3.397% | 2.515% |  |  |
Long-term debt |  | $ 1,000 | $ 277 |  |  |
Notes Payable | Floating rate notes due March 2021 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate |  | 3.487% | 2.605% |  |  |
Long-term debt |  | $ 1,000 | $ 1,000 |  |  |
Notes Payable | 3-year tranche term loan due November 2021 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument term | 3 years | 3 years |  |  |  |
Long-term debt |  | $ 3,000 | 0 |  |  |
Other Debt Obligations |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt |  | $ 19 | $ 279 |  |  |

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