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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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