Debt - Total Debt Schedule (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Short-term debt:
Commercial Paper	$ 2,045	$ 1,233
Total short-term debt	2,645	1,833
Long-term debt:
Total long-term debt	4,271	4,267
Total debt	$ 6,916	6,100
2018 Senior Notes (2.50% senior unsecured notes due October 15, 2018)
Debt Instrument [Line Items]
Interest rate, stated percentage	2.50%
Short-term debt:
Total short-term debt	$ 600	600
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	$ 1,245	1,244
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	$ 496	495
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	$ 792	791
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	$ 1,243	1,242
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	$ 495	$ 495

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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