Debt - Schedule of Debt (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Sep. 30, 2018
Short-term and current maturities of long-term debt:
Total short-term and current maturities of long-term debt	$ 508	$ 384
Finance lease and other financing obligations	268	240
Long-term debt:
Unamortized discount and deferred financing costs	(125)	(155)
Finance lease and other financing obligations	528	504
Total long-term debt	$ 20,729	20,300
Senior Notes | 4.750% senior notes due June 2021
Debt Instrument [Line Items]
Interest rate, stated percentage	4.75%
Long-term debt:
Long-term debt	$ 0	400
Senior Notes | 3.500% senior notes due October 2022
Debt Instrument [Line Items]
Interest rate, stated percentage	3.50%
Long-term debt:
Long-term debt	$ 700	700
Senior Notes | 0.375% senior notes due July 2023 (Euro-denominated)
Debt Instrument [Line Items]
Interest rate, stated percentage	0.375%
Long-term debt:
Long-term debt	$ 566	612
Senior Notes | 3.800% senior notes due October 2023
Debt Instrument [Line Items]
Interest rate, stated percentage			3.80%
Long-term debt:
Long-term debt	$ 1,000	1,000
Senior Notes | 2.750% senior notes due July 2024
Debt Instrument [Line Items]
Interest rate, stated percentage	2.75%
Long-term debt:
Long-term debt	$ 2,000	2,000
Senior Notes | 3.850% senior notes due June 2025
Debt Instrument [Line Items]
Interest rate, stated percentage	3.85%
Long-term debt:
Long-term debt	$ 900	900
Senior Notes | 2.250% senior notes due July 2025 (British Pound-denominated)
Debt Instrument [Line Items]
Interest rate, stated percentage	2.25%
Long-term debt:
Long-term debt	$ 705	709
Senior Notes | 3.200% senior notes due July 2026
Debt Instrument [Line Items]
Interest rate, stated percentage	3.20%
Long-term debt:
Long-term debt	$ 2,000	2,000
Senior Notes | 2.250% senior notes due June 2027
Debt Instrument [Line Items]
Interest rate, stated percentage	2.25%
Long-term debt:
Long-term debt	$ 1,000	1,000
Senior Notes | 1.125% senior notes due July 2027 (Euro-denominated)
Debt Instrument [Line Items]
Interest rate, stated percentage	1.125%
Long-term debt:
Long-term debt	$ 566	612
Senior Notes | 4.200% senior notes due October 2028
Debt Instrument [Line Items]
Interest rate, stated percentage			4.20%
Long-term debt:
Long-term debt	$ 1,000	1,000
Senior Notes | 3.500% senior notes due July 2029
Debt Instrument [Line Items]
Interest rate, stated percentage	3.50%
Long-term debt:
Long-term debt	$ 3,000	3,000
Senior Notes | 2.650% senior notes due June 2030
Debt Instrument [Line Items]
Interest rate, stated percentage	2.65%
Long-term debt:
Long-term debt	$ 1,000	1,000
Senior Notes | 1.625% senior notes due July 2030 (Euro-denominated)
Debt Instrument [Line Items]
Interest rate, stated percentage	1.625%
Long-term debt:
Long-term debt	$ 566	612
Senior Notes | 3.000% senior notes due July 2031 (British Pound-denominated)
Debt Instrument [Line Items]
Interest rate, stated percentage	3.00%
Long-term debt:
Long-term debt	$ 705	709
Senior Notes | 4.400% senior notes due July 2049
Debt Instrument [Line Items]
Interest rate, stated percentage	4.40%
Long-term debt:
Long-term debt	$ 2,000	2,000
Receivable securitized loan
Long-term debt:
Long-term debt	500	425
Line of Credit | Revolving credit facility
Long-term debt:
Long-term debt	97	22
Line of Credit | Term loan facility
Long-term debt:
Long-term debt	200	1,250
Commercial Paper | U.S. commercial paper notes
Long-term debt:
Long-term debt	916	0
Commercial Paper | Euro commercial paper notes
Long-term debt:
Long-term debt	905	0
Foreign lines of credit
Short-term and current maturities of long-term debt:
Total short-term and current maturities of long-term debt	$ 240	$ 144