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Debt - Total Debt Schedule (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Aug. 20, 2020	May 26, 2020	Aug. 13, 2018
Debt Instrument [Line Items]
Commercial Paper	$ 1,012	$ 2,405
Other short-term debt	10	6
Total short-term debt	1,521	2,411
Long-term debt:
Total long-term debt	12,397	14,126
Total debt	13,918	16,537
Senior Notes \| 2022 Senior Notes (2.35% senior unsecured notes due September 15, 2022)
Debt Instrument [Line Items]
Total short-term debt	499	0
Long-term debt:
Senior notes	0	498
Total debt	$ 499	498
Interest rate, stated percentage	2.35%
Senior Notes \| 2023 Senior Notes (floating rate senior unsecured notes due June 15, 2023)
Long-term debt:
Senior notes	$ 0	1,244
Total debt	0	1,244
Senior Notes \| 2023 Senior Notes (0.70% senior unsecured notes due June 15, 2023)
Long-term debt:
Senior notes	997	995
Total debt	$ 997	995
Interest rate, stated percentage	0.70%		0.70%
Senior Notes \| 2023 Senior Notes (3.45% senior unsecured notes due September 21, 2023)
Long-term debt:
Senior notes	$ 399	398
Total debt	$ 399	398
Interest rate, stated percentage	3.45%				3.45%
Senior Notes \| 2023 Senior Notes (4.00% senior unsecured notes due October 15, 2023)
Long-term debt:
Senior notes	$ 797	796
Total debt	$ 797	796
Interest rate, stated percentage	4.00%
Senior Notes \| 2025 Senior Notes (3.75% senior unsecured notes due December 1, 2025)
Long-term debt:
Senior notes	$ 1,246	1,245
Total debt	$ 1,246	1,245
Interest rate, stated percentage	3.75%
Senior Notes \| 2027 Senior Notes (3.10% senior unsecured notes due September 15, 2027)
Long-term debt:
Senior notes	$ 497	496
Total debt	$ 497	496
Interest rate, stated percentage	3.10%
Senior Notes \| 2028 Senior Notes (3.75% senior unsecured notes due September 21, 2028)
Long-term debt:
Senior notes	$ 594	593
Total debt	$ 594	593
Interest rate, stated percentage	3.75%				3.75%
Senior Notes \| 2030 Senior Notes (2.10% senior unsecured notes due June 15, 2030)
Long-term debt:
Senior notes	$ 1,234	1,232
Total debt	$ 1,234	1,232
Interest rate, stated percentage	2.10%			2.10%
Senior Notes \| 2032 Senior Notes (1.85% senior unsecured notes due September 15, 2032)
Long-term debt:
Senior notes	$ 1,483	1,481
Total debt	$ 1,483	1,481
Interest rate, stated percentage	1.85%		1.85%
Senior Notes \| 2040 Senior Notes (2.65% senior unsecured notes due September 15, 2040)
Long-term debt:
Senior notes	$ 1,230	1,229
Total debt	$ 1,230	1,229
Interest rate, stated percentage	2.65%		2.65%
Senior Notes \| 2048 Senior Notes (4.25% senior unsecured notes due September 21, 2048)
Long-term debt:
Senior notes	$ 1,230	1,230
Total debt	$ 1,230	1,230
Interest rate, stated percentage	4.25%				4.25%
Senior Notes \| 2050 Senior Notes (3.00% senior unsecured notes due June 15, 2050)
Long-term debt:
Senior notes	$ 1,220	1,219
Total debt	$ 1,220	1,219
Interest rate, stated percentage	3.00%			3.00%
Senior Notes \| 2060 Senior Notes (3.00% senior unsecured notes due September 15, 2060)
Long-term debt:
Senior notes	$ 1,470	1,470
Total debt	$ 1,470	$ 1,470
Interest rate, stated percentage	3.00%		3.00%