Debt - Schedule of Outstanding Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Short-term debt:
Commercial Paper	$ 1,318	$ 951
Other short-term debt	11	0
Total short-term debt	1,329	951
Long-term debt:
Senior notes	7,825
Total long-term debt	6,496	6,490
Total debt	$ 7,825	7,441
2020 Senior Notes (2.75% senior unsecured notes due December 1, 2020)
Debt Instrument [Line Items]
Interest rate, stated percentage	2.75%
Long-term debt:
Senior notes	$ 1,247
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	$ 497
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	$ 397
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	$ 794
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	$ 1,244
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
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	$ 592
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	$ 1,229
Senior Notes \| 2020 Senior Notes (2.75% senior unsecured notes due December 1, 2020)
Debt Instrument [Line Items]
Interest rate, stated percentage	2.75%
Long-term debt:
Senior notes	$ 1,247	1,246
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	$ 497	496
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	$ 397	397
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	$ 794	793
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	$ 1,244	1,243
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	$ 592	591
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	$ 1,229	$ 1,228

Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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