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Borrowings - Schedule of Borrowings (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2019 | Aug. 31, 2019 | Aug. 15, 2019 | Jan. 01, 2019
Debt Instrument [Line Items] |  |  |  |  |
Short-term debt (commercial paper) | $ 720 | $ 1,070 |  |  |
Long-term debt gross | 74,265 | 69,848 |  |  |
Debt premiums | 302 | 267 |  |  |
Debt discounts and deferred financing costs | (1,138) | (1,061) |  |  |
Long-term Debt | 73,429 | 69,054 |  |  |
Short-term debt (commercial paper) | (720) | (1,070) |  |  |
Current portion of long-term debt | (1,265) | (3,778) |  |  | $ (1,267)
Long-term debt | $ 71,444 | 64,206 |  |  | $ 71,348
Senior Notes | 2.2% senior notes due March 2019 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt interest rate | 2.20% |  |  |  |
Long-term debt gross | $ 375 | 0 |  |  |
Senior Notes | 2.25% senior notes due August 2019 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt interest rate | 2.25% |  |  |  |
Long-term debt gross | $ 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 gross | 2,000 | $ 723 |  |  |
Senior Notes | 2.8% senior notes due July 2020 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt interest rate |  | 2.80% |  |  |
Long-term debt gross | 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 gross | 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 gross | 550 | $ 222 |  |  |
Senior Notes | 2.125% senior notes due June 2021 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt interest rate |  | 2.125% |  |  |
Long-term debt gross | 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 gross | 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 gross | 600 | $ 187 |  |  |
Senior Notes | 3.5% senior notes due July 2022 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt interest rate |  | 3.50% |  |  |
Long-term debt gross | 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 gross | 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 gross | 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 gross | 399 | $ 399 |  |  |
Senior Notes | 3.7% senior notes due March 2023 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt interest rate |  | 3.70% |  |  |
Long-term debt gross | 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 gross | 1,300 | $ 1,300 |  |  |
Senior Notes | 4% senior notes due December 2023 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt interest rate |  | 4.00% |  |  |
Long-term debt gross | 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 gross | 0 | $ 1,000 |  |  |
Senior Notes | 3.375% senior notes due August 2024 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt interest rate |  | 3.375% |  |  |
Long-term debt gross | 650 | $ 650 |  |  |
Senior Notes | 3.5% senior notes due November 2024 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt interest rate |  | 3.50% |  |  |
Long-term debt gross | 750 | $ 750 |  |  |
Senior Notes | 5% senior notes due December 2024 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt interest rate |  | 5.00% |  |  |
Long-term debt gross | 299 | $ 299 |  |  |
Senior Notes | 4.1% senior notes due March 2025 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt interest rate |  | 4.10% |  |  |
Long-term debt gross | 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 gross | 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 gross | 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 gross | 0 | $ 750 |  |  |
Senior Notes | 6.25% senior notes due June 2027 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt interest rate |  | 6.25% |  |  |
Long-term debt gross | 372 | $ 372 |  |  |
Senior Notes | 4.3% senior notes due March 2028 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt interest rate |  | 4.30% |  |  |
Long-term debt gross | 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 gross | 0 | $ 1,750 |  |  |
Senior Notes | 4.875% senior notes due July 2035 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt interest rate |  | 4.875% |  |  |
Long-term debt gross | 652 | $ 652 |  |  |
Senior Notes | 6.625% senior notes due June 2036 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt interest rate |  | 6.625% |  |  |
Long-term debt gross | 771 | $ 771 |  |  |
Senior Notes | 6.75% senior notes due December 2037 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt interest rate |  | 6.75% |  |  |
Long-term debt gross | 533 | $ 533 |  |  |
Senior Notes | 4.78% senior notes due March 2038 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt interest rate |  | 4.78% |  |  |
Long-term debt gross | 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 gross | 447 | $ 447 |  |  |
Senior Notes | 5.75% senior notes due May 2041 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt interest rate |  | 5.75% |  |  |
Long-term debt gross | 133 | $ 133 |  |  |
Senior Notes | 4.5% senior notes due May 2042 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt interest rate |  | 4.50% |  |  |
Long-term debt gross | 500 | $ 500 |  |  |
Senior Notes | 4.125% senior notes due November 2042 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt interest rate |  | 4.125% |  |  |
Long-term debt gross | 500 | $ 500 |  |  |
Senior Notes | 5.3% senior notes due December 2043 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt interest rate |  | 5.30% |  |  |
Long-term debt gross | 750 | $ 750 |  |  |
Senior Notes | 4.75% senior notes due March 2044 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt interest rate |  | 4.75% |  |  |
Long-term debt gross | 375 | $ 375 |  |  |
Senior Notes | 5.125% senior notes due July 2045 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt interest rate |  | 5.125% |  |  |
Long-term debt gross | 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 gross | 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 gross | 8,000 | $ 8,000 |  |  |
Floating Rate Notes | Floating rate notes due March 2020 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt gross | 1,000 | 277 |  |  |
Floating Rate Notes | Floating rate notes due March 2021 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt gross | 1,000 | 1,000 |  |  |
Floating Rate Notes | 3-year tranche term loan due November 2021 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt gross | $ 3,000 | 0 |  |  |
Debt instrument term | 3 years |  |  |  |
Capital Lease Obligations |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt gross | $ 642 | 618 |  |  |
Other Debt Obligations |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt gross | $ 19 | $ 1 |  |  |

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