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Debt and Credit Facilities - Summary of Debt Carrying Amount (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Long-term debt	$ 30,500
Short-term and long-term debt	31,402		$ 24,593
Long-term debt, current maturities	2,757		2,499
Total long-term debt, net	28,645		22,094
Senior notes
Debt Instrument [Line Items]
Long-term debt	$ 30,295		24,593
Senior notes | 2.35% Senior Unsecured Notes Due In February 2020
Debt Instrument [Line Items]
Interest rate, stated percentage	2.35%
Long-term debt	$ 0		500
Senior notes | 2.55% Senior Unsecured Notes Due in September 2020
Debt Instrument [Line Items]
Interest rate, stated percentage	2.55%
Long-term debt	$ 0		1,999
Senior notes | 4.50% Senior Unsecured Notes Due in April 2021
Debt Instrument [Line Items]
Interest rate, stated percentage	4.50%
Long-term debt	$ 1,000		998
Senior notes | 0.15% LIBOR Senior Unsecured Notes Due September 2021
Debt Instrument [Line Items]
Long-term debt	$ 499		0
Senior notes | 4.40% Senior Unsecured Notes Due In December 2021
Debt Instrument [Line Items]
Interest rate, stated percentage	4.40%
Long-term debt	$ 1,249		1,248
Senior notes | 1.95% Senior Unsecured Notes Due in March 2022
Debt Instrument [Line Items]
Interest rate, stated percentage	1.95%
Long-term debt	$ 499		499
Senior notes | 3.25% Senior Unsecured Notes Due in September 2022
Debt Instrument [Line Items]
Interest rate, stated percentage	3.25%
Long-term debt	$ 998		998
Senior notes | 2.50% Senior Unsecured Notes Due in September 2023
Debt Instrument [Line Items]
Interest rate, stated percentage	2.50%
Long-term debt	$ 748		747
Senior notes | 0.52% LIBOR Senior Unsecured Notes Due September 2023
Debt Instrument [Line Items]
Long-term debt	498		0
Senior notes | 0.75% Senior Unsecured Notes Due in September 2023
Debt Instrument [Line Items]
Long-term debt	1,992		0
Senior notes | Variable Term Loan Note Due October 2023
Debt Instrument [Line Items]
Long-term debt	$ 998		0
Senior notes | 3.70% Senior Unsecured Notes Due in April 2024
Debt Instrument [Line Items]
Interest rate, stated percentage	3.70%
Long-term debt	$ 1,746		1,745
Senior notes | 3.50% Senior Unsecured Notes Due in February 2025
Debt Instrument [Line Items]
Interest rate, stated percentage	3.50%
Long-term debt	$ 1,746		1,746
Senior notes | 3.65% Senior Unsecured Notes Due in March 2026
Debt Instrument [Line Items]
Interest rate, stated percentage	3.65%
Long-term debt	$ 2,737		2,734
Senior notes | 2.95% Senior Unsecured Notes Due in March 2027
Debt Instrument [Line Items]
Interest rate, stated percentage	2.95%
Long-term debt	$ 1,246		1,245
Senior notes | 1.20% Senior Unsecured Notes Due October 2027
Debt Instrument [Line Items]
Interest rate, stated percentage	1.20%	1.20%
Long-term debt	$ 745		0
Senior notes | 1.65% Senior Unsecured Notes Due October 2030
Debt Instrument [Line Items]
Interest rate, stated percentage	1.65%	1.65%
Long-term debt	$ 992		0
Senior notes | 4.60% Senior Unsecured Notes Due in September 2035
Debt Instrument [Line Items]
Interest rate, stated percentage	4.60%
Long-term debt	$ 991		991
Senior notes | 4.00% Senior Unsecured Notes Due in September 2036
Debt Instrument [Line Items]
Interest rate, stated percentage	4.00%
Long-term debt	$ 741		741
Senior notes | 2.60% Senior Unsecured Notes Due October 2040
Debt Instrument [Line Items]
Interest rate, stated percentage	2.60%	2.60%
Long-term debt	$ 986		0
Senior notes | 5.65% Senior Unsecured Notes Due in December 2041
Debt Instrument [Line Items]
Interest rate, stated percentage	5.65%
Long-term debt	$ 996		995
Senior notes | 4.80% Senior Unsecured Notes Due in April 2044
Debt Instrument [Line Items]
Interest rate, stated percentage	4.80%
Long-term debt	$ 1,735		1,734
Senior notes | 4.50% Senior Unsecured Notes Due in February 2045
Debt Instrument [Line Items]
Interest rate, stated percentage	4.50%
Long-term debt	$ 1,732		1,731
Senior notes | 4.75% Senior Unsecured Notes Due in March 2046
Debt Instrument [Line Items]
Interest rate, stated percentage	4.75%
Long-term debt	$ 2,219		2,217
Senior notes | 4.15% Senior Unsecured Notes Due in March 2047
Debt Instrument [Line Items]
Interest rate, stated percentage	4.15%
Long-term debt	$ 1,726		1,725
Senior notes | 2.80% Senior Unsecured Notes Due October 2050
Debt Instrument [Line Items]
Interest rate, stated percentage	2.80%	2.80%
Long-term debt	$ 1,476		0
Other notes payable
Debt Instrument [Line Items]
Long-term debt	$ 1,107		$ 0
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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