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Debt and Credit Facilities - Summary of Debt Carrying Amount (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total	$ 26,695	$ 31,402
Less: current portion of long-term debt and other obligations, net	1,516	2,757
Total long-term debt, net	25,179	28,645
Senior Notes And Medium-Term Notes
Debt Instrument [Line Items]
Total	25,571	30,295
Senior notes
Debt Instrument [Line Items]
Total	$ 25,750
Senior notes | 4.50% Senior Unsecured Notes Due in April 2021
Debt Instrument [Line Items]
Interest Rate	4.50%
Total	$ 0	1,000
Senior notes | 0.15% LIBOR Senior Unsecured Notes Due September 2021
Debt Instrument [Line Items]
Total	$ 0	499
Senior notes | 4.40% Senior Unsecured Notes Due In December 2021
Debt Instrument [Line Items]
Interest Rate	4.40%
Total	$ 0	1,249
Senior notes | 1.95% Senior Unsecured Notes Due in March 2022
Debt Instrument [Line Items]
Interest Rate	1.95%
Total	$ 500	499
Senior notes | 3.25% Senior Unsecured Notes Due in September 2022
Debt Instrument [Line Items]
Interest Rate	3.25%
Total	$ 999	998
Senior notes | 2.50% Senior Unsecured Notes Due in September 2023
Debt Instrument [Line Items]
Interest Rate	2.50%
Total	$ 748	748
Senior notes | 0.52% LIBOR Senior Unsecured Notes Due September 2023
Debt Instrument [Line Items]
Total	$ 0	498
Senior notes | 0.75% Senior Unsecured Notes Due in September 2023
Debt Instrument [Line Items]
Interest Rate	0.75%
Total	$ 1,496	1,992
Senior notes | 3.70% Senior Unsecured Notes Due in April 2024
Debt Instrument [Line Items]
Interest Rate	3.70%
Total	$ 1,747	1,746
Senior notes | 3.50% Senior Unsecured Notes Due in February 2025
Debt Instrument [Line Items]
Interest Rate	3.50%
Total	$ 1,747	1,746
Senior notes | 3.65% Senior Unsecured Notes Due in March 2026
Debt Instrument [Line Items]
Interest Rate	3.65%
Total	$ 2,739	2,737
Senior notes | 2.95% Senior Unsecured Notes Due in March 2027
Debt Instrument [Line Items]
Interest Rate	2.95%
Total	$ 1,247	1,246
Senior notes | 1.20% Senior Unsecured Notes Due October 2027
Debt Instrument [Line Items]
Interest Rate	1.20%
Total	$ 746	745
Senior notes | 1.65% Senior Unsecured Notes Due October 2030
Debt Instrument [Line Items]
Interest Rate	1.65%
Total	$ 993	992
Senior notes | 4.60% Senior Unsecured Notes Due in September 2035
Debt Instrument [Line Items]
Interest Rate	4.60%
Total	$ 992	991
Senior notes | 4.00% Senior Unsecured Notes Due in September 2036
Debt Instrument [Line Items]
Interest Rate	4.00%
Total	$ 742	741
Senior notes | 2.60% Senior Unsecured Notes Due October 2040
Debt Instrument [Line Items]
Interest Rate	2.60%
Total	$ 987	986
Senior notes | 5.65% Senior Unsecured Notes Due in December 2041
Debt Instrument [Line Items]
Interest Rate	5.65%
Total	$ 996	996
Senior notes | 4.80% Senior Unsecured Notes Due in April 2044
Debt Instrument [Line Items]
Interest Rate	4.80%
Total	$ 1,736	1,735
Senior notes | 4.50% Senior Unsecured Notes Due in February 2045
Debt Instrument [Line Items]
Interest Rate	4.50%
Total	$ 1,733	1,732
Senior notes | 4.75% Senior Unsecured Notes Due in March 2046
Debt Instrument [Line Items]
Interest Rate	4.75%
Total	$ 2,220	2,219
Senior notes | 4.15% Senior Unsecured Notes Due in March 2047
Debt Instrument [Line Items]
Interest Rate	4.15%
Total	$ 1,727	1,726
Senior notes | 2.80% Senior Unsecured Notes Due October 2050
Debt Instrument [Line Items]
Interest Rate	2.80%
Total	$ 1,476	1,476
Medium-term notes | Variable Term Loan Note Due October 2023
Debt Instrument [Line Items]
Total	0	998
Other notes payable
Debt Instrument [Line Items]
Total	$ 1,124	$ 1,107
LIBOR rate | Senior notes | 0.15% LIBOR Senior Unsecured Notes Due September 2021
Debt Instrument [Line Items]
Basis spread on variable rate	0.15%
LIBOR rate | Senior notes | 0.52% LIBOR Senior Unsecured Notes Due September 2023
Debt Instrument [Line Items]
Basis spread on variable rate	0.52%

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