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Debt - Schedule of Outstanding Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2020	Aug. 20, 2020	May 26, 2020	Dec. 31, 2019
Short-term debt:
Commercial Paper	$ 2,460			$ 1,311
Other short-term debt	3			10
Total short-term debt	2,463			2,569
Long-term debt:
Total long-term debt	14,869			5,250
Total debt	17,332			7,819
2022 Term Loan
Long-term debt:
Senior notes	747
2022 Senior Notes (2.35% senior unsecured notes due September 15, 2022)
Long-term debt:
Senior notes	498
2023 Senior Notes (floating rate senior unsecured notes due June 15, 2023)
Long-term debt:
Senior notes	1,244
2023 Senior Notes (0.70% senior unsecured notes due June 15, 2023)
Long-term debt:
Senior notes	994
2023 Senior Notes (3.45% senior unsecured notes due September 21, 2023)
Long-term debt:
Senior notes	398
2023 Senior Notes (4.00% senior unsecured notes due October 15, 2023)
Long-term debt:
Senior notes	795
2025 Senior Notes (3.75% senior unsecured notes due December 1, 2025)
Long-term debt:
Senior notes	1,245
2027 Senior Notes (3.10% senior unsecured notes due September 15, 2027)
Long-term debt:
Senior notes	496
2028 Senior Notes (3.75% senior unsecured notes due September 21, 2028)
Long-term debt:
Senior notes	593
2030 Senior Notes (2.10% senior unsecured notes due June 15, 2030)
Long-term debt:
Senior notes	1,231
2032 Senior Notes (1.85% senior unsecured notes due September 15, 2032)
Long-term debt:
Senior notes	1,481
2040 Senior Notes (2.65% senior unsecured notes due September 15, 2040)
Long-term debt:
Senior notes	1,229
2048 Senior Notes (4.25% senior unsecured notes due September 21, 2048)
Long-term debt:
Senior notes	1,230
2050 Senior Notes (3.00% senior unsecured notes due June 15, 2050)
Long-term debt:
Senior notes	1,219
2060 Senior Notes (3.00% senior unsecured notes due September 15, 2060)
Long-term debt:
Senior notes	$ 1,469
Senior Notes \| 2020 Senior Notes (2.75% senior unsecured notes due December 1, 2020)
Debt Instrument [Line Items]
Interest rate, stated percentage	2.75%		2.75%
Short-term debt:
Short-term debt	$ 0			1,248
Senior Notes \| 2022 Senior Notes (2.35% senior unsecured notes due September 15, 2022)
Debt Instrument [Line Items]
Interest rate, stated percentage	2.35%
Long-term debt:
Senior notes	$ 498			497
Senior Notes \| 2023 Senior Notes (floating rate senior unsecured notes due June 15, 2023)
Long-term debt:
Senior notes	$ 1,244			0
Senior Notes \| 2023 Senior Notes (0.70% senior unsecured notes due June 15, 2023)
Debt Instrument [Line Items]
Interest rate, stated percentage	0.70%	0.70%
Long-term debt:
Senior notes	$ 994			0
Senior Notes \| 2023 Senior Notes (3.45% senior unsecured notes due September 21, 2023)
Debt Instrument [Line Items]
Interest rate, stated percentage	3.45%
Long-term debt:
Senior notes	$ 398			398
Senior Notes \| 2023 Senior Notes (4.00% senior unsecured notes due October 15, 2023)
Debt Instrument [Line Items]
Interest rate, stated percentage	4.00%
Long-term debt:
Senior notes	$ 795			794
Senior Notes \| 2025 Senior Notes (3.75% senior unsecured notes due December 1, 2025)
Debt Instrument [Line Items]
Interest rate, stated percentage	3.75%
Long-term debt:
Senior notes	$ 1,245			1,244
Senior Notes \| 2027 Senior Notes (3.10% senior unsecured notes due September 15, 2027)
Debt Instrument [Line Items]
Interest rate, stated percentage	3.10%
Long-term debt:
Senior notes	$ 496			496
Senior Notes \| 2028 Senior Notes (3.75% senior unsecured notes due September 21, 2028)
Debt Instrument [Line Items]
Interest rate, stated percentage	3.75%
Long-term debt:
Senior notes	$ 593			592
Senior Notes \| 2030 Senior Notes (2.10% senior unsecured notes due June 15, 2030)
Debt Instrument [Line Items]
Interest rate, stated percentage	2.10%		2.10%
Long-term debt:
Senior notes	$ 1,231			0
Senior Notes \| 2032 Senior Notes (1.85% senior unsecured notes due September 15, 2032)
Debt Instrument [Line Items]
Interest rate, stated percentage	1.85%	1.85%
Long-term debt:
Senior notes	$ 1,481			0
Senior Notes \| 2040 Senior Notes (2.65% senior unsecured notes due September 15, 2040)
Debt Instrument [Line Items]
Interest rate, stated percentage	2.65%	2.65%
Long-term debt:
Senior notes	$ 1,229			0
Senior Notes \| 2048 Senior Notes (4.25% senior unsecured notes due September 21, 2048)
Debt Instrument [Line Items]
Interest rate, stated percentage	4.25%
Long-term debt:
Senior notes	$ 1,230			1,229
Senior Notes \| 2050 Senior Notes (3.00% senior unsecured notes due June 15, 2050)
Debt Instrument [Line Items]
Interest rate, stated percentage	3.00%		3.00%
Long-term debt:
Senior notes	$ 1,219			0
Senior Notes \| 2060 Senior Notes (3.00% senior unsecured notes due September 15, 2060)
Debt Instrument [Line Items]
Interest rate, stated percentage	3.00%	3.00%
Long-term debt:
Senior notes	$ 1,469			0
Term Loan \| 2022 Term Loan
Long-term debt:
Senior notes	$ 747			$ 0