Debt - Total Debt Schedule (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Commercial Paper	$ 951	$ 1,233
Short-term debt	951	1,833
Long-term debt:
Total long-term debt	6,490	4,267
Total debt	7,441	6,100
2018 Senior Notes (2.50% senior unsecured notes due October 15, 2018)
Debt Instrument [Line Items]
Short-term debt	$ 0	600
Long-term debt:
Interest rate, stated percentage	2.50%
2020 Senior Notes (2.75% senior unsecured notes due December 1, 2020)
Long-term debt:
Senior notes	$ 1,250	1,244
Interest rate, stated percentage	2.75%
2022 Senior Notes (2.35% senior unsecured notes due September 15, 2022)
Long-term debt:
Senior notes	$ 496	495
Interest rate, stated percentage	2.35%
2023 Senior Notes (3.45% senior unsecured notes due September 21, 2023)
Long-term debt:
Senior notes	$ 397	0
Interest rate, stated percentage	3.45%
2023 Senior Notes (4.00% senior unsecured notes due October 15, 2023)
Long-term debt:
Senior notes	$ 793	791
Interest rate, stated percentage	4.00%
2025 Senior Notes (3.75% senior unsecured notes due December 1, 2025)
Long-term debt:
Senior notes	$ 1,240	1,242
Interest rate, stated percentage	3.75%
2027 Senior Notes (3.10% senior unsecured notes due September 15, 2027)
Long-term debt:
Senior notes	$ 496	495
Interest rate, stated percentage	3.10%
2028 Senior Notes (3.75% senior unsecured notes due September 21, 2028)
Long-term debt:
Senior notes	$ 591	0
Interest rate, stated percentage	3.75%
2048 Senior Notes (4.25% senior unsecured notes due September 21, 2048)
Long-term debt:
Senior notes	$ 1,230	$ 0
Interest rate, stated percentage	4.25%

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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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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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