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Debt and Credit Facilities - Summary of Debt Carrying Amount (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |
Short-term and long-term deb | $ 24,593 | $ 27,322
Long-term debt, current maturities | 2,499 | 2,748
Total long-term debt, net | 22,094 | 24,574
Unsecured Debt | 2017 Senior Unsecured Notes Due in March 2019 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 0 | 750
Unsecured Debt | Senior Unsecured Notes Due in April 2019 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 2.05% |
Long-term debt | $ 0 | 500
Unsecured Debt | 2017 Senior Unsecured Notes Due in September 2019 with Fixed Rate |  |
Debt Instrument [Line Items] |  |
Interest Rate | 1.85% |
Long-term debt | $ 0 | 999
Unsecured Debt | 2017 Senior Unsecured Notes Due in September 2019 with Floating Rate |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 0 | 499
Unsecured Debt | Senior Unsecured Notes Due In February 2020 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 2.35% |
Long-term debt | $ 500 | 499
Unsecured Debt | Senior Unsecured Notes Due in September 2020 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 2.55% |
Long-term debt | $ 1,999 | 1,996
Unsecured Debt | Senior Unsecured Notes Due in April 2021 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 4.50% |
Long-term debt | $ 998 | 997
Unsecured Debt | Senior Unsecured Notes Due In December 2021 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 4.40% |
Long-term debt | $ 1,248 | 1,247
Unsecured Debt | Senior Unsecured Notes Due in March 2022 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 1.95% |
Long-term debt | $ 499 | 498
Unsecured Debt | Senior Unsecured Notes Due in September 2022 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 3.25% |
Long-term debt | $ 998 | 997
Unsecured Debt | Senior Unsecured Notes Due in September 2023 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 2.50% |
Long-term debt | $ 747 | 746
Unsecured Debt | Senior Unsecured Notes Due in April 2024 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 3.70% |
Long-term debt | $ 1,745 | 1,744
Unsecured Debt | Senior Unsecured Notes Due in February 2025 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 3.50% |
Long-term debt | $ 1,746 | 1,745
Unsecured Debt | Senior Unsecured Notes Due in March 2026 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 3.65% |
Long-term debt | $ 2,734 | 2,731
Unsecured Debt | Senior Unsecured Notes Due in March 2027 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 2.95% |
Long-term debt | $ 1,245 | 1,245
Unsecured Debt | Senior Unsecured Notes Due in September 2035 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 4.60% |
Long-term debt | $ 991 | 990
Unsecured Debt | Senior Unsecured Notes Due in September 2036 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 4.00% |
Long-term debt | $ 741 | 740
Unsecured Debt | Senior Unsecured Notes Due in December 2041 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 5.65% |
Long-term debt | $ 995 | 995
Unsecured Debt | Senior Unsecured Notes Due in April 2044 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 4.80% |
Long-term debt | $ 1,734 | 1,734
Unsecured Debt | Senior Unsecured Notes Due in February 2045 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 4.50% |
Long-term debt | $ 1,731 | 1,730
Unsecured Debt | Senior Unsecured Notes Due in March 2046 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 4.75% |
Long-term debt | $ 2,217 | 2,216
Unsecured Debt | Senior Unsecured Notes Due in March 2047 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 4.15% |
Long-term debt | $ 1,725 | $ 1,724
London Interbank Offered Rate (LIBOR) | 2017 Senior Unsecured Notes Due in September 2019 with Floating Rate |  |
Debt Instrument [Line Items] |  |
Debt instrument, Basis spread on variable rate | 0.25% |
London Interbank Offered Rate (LIBOR) | 2017 Senior Unsecured Notes Due in March 2019 |  |
Debt Instrument [Line Items] |  |
Debt instrument, Basis spread on variable rate | 0.22% |

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