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Debt and Credit Facilities - Summary of Debt Carrying Amount (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |
Long-term debt | $ 29,060 | $ 33,542
Less current portion | 2,998 | 2,747
Total long-term debt, net | 26,062 | 30,795
Term Loan Facilities | Term Loan Due October 2018 |  |
Debt Instrument [Line Items] |  |
Long-term debt | 0 | 999
Term Loan Facilities | Term Loan Due October 2020 |  |
Debt Instrument [Line Items] |  |
Long-term debt | 0 | 998
Term Loan Facilities | Term Loan Due October 2022 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 0 | 2,497
Unsecured Debt | Senior Unsecured Notes Due in September 2018 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 1.85% |
Long-term debt | $ 1,000 | 999
Unsecured Debt | 2017 Senior Unsecured Notes Due in September 2018 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 750 | 749
Basis Spread | 0.17% |
Variable Rate Basis | 3-month LIBOR |
Unsecured Debt | 2017 Senior Unsecured Notes Due in March 2019 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 749 | 748
Basis Spread | 0.22% |
Variable Rate Basis | 3-month LIBOR |
Unsecured Debt | Senior Unsecured Notes Due in April 2019 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 2.05% |
Long-term debt | $ 499 | 499
Unsecured Debt | 2017 Senior Unsecured Notes Due in September 2019 with Fixed Rate |  |
Debt Instrument [Line Items] |  |
Interest Rate | 1.85% |
Long-term debt | $ 998 | 997
Unsecured Debt | 2017 Senior Unsecured Notes Due in September 2019 with Floating Rate |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 499 | 499
Basis Spread | 0.25% |
Variable Rate Basis | 3-month LIBOR |
Unsecured Debt | Senior Unsecured Notes Due In February 2020 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 2.35% |
Long-term debt | $ 499 | 499
Unsecured Debt | Senior Unsecured Notes Due in September 2020 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 2.55% |
Long-term debt | $ 1,995 | 1,994
Unsecured Debt | Senior Unsecured Notes Due in April 2021 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 4.50% |
Long-term debt | $ 996 | 995
Unsecured Debt | Senior Unsecured Notes Due In December 2021 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 4.40% |
Long-term debt | $ 1,247 | 1,246
Unsecured Debt | Senior Unsecured Notes Due in March 2022 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 1.95% |
Long-term debt | $ 498 | 497
Unsecured Debt | Senior Unsecured Notes Due in September 2022 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 3.25% |
Long-term debt | $ 997 | 996
Unsecured Debt | Senior Unsecured Notes Due in September 2023 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 2.50% |
Long-term debt | $ 745 | 745
Unsecured Debt | Senior Unsecured Notes Due in April 2024 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 3.70% |
Long-term debt | $ 1,743 | 1,742
Unsecured Debt | Senior Unsecured Notes Due in February 2025 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 3.50% |
Long-term debt | $ 1,744 | 1,744
Unsecured Debt | Senior Unsecured Notes Due in March 2026 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 3.65% |
Long-term debt | $ 2,730 | 2,729
Unsecured Debt | Senior Unsecured Notes Due in March 2027 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 2.95% |
Long-term debt | $ 1,244 | 1,244
Unsecured Debt | Senior Unsecured Notes Due in September 2035 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 4.60% |
Long-term debt | $ 990 | 990
Unsecured Debt | Senior Unsecured Notes Due in September 2036 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 4.00% |
Long-term debt | $ 740 | 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 | $ 1,733 | 1,733
Unsecured Debt | Senior Unsecured Notes Due in February 2045 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 4.50% |
Long-term debt | $ 1,730 | 1,730
Unsecured Debt | Senior Unsecured Notes Due in March 2046 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 4.75% |
Long-term debt | $ 2,215 | 2,215
Unsecured Debt | Senior Unsecured Notes Due in March 2047 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 4.15% |
Long-term debt | $ 1,724 | $ 1,723

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