Debt - Total Debt Schedule (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Commercial Paper	$ 1,233	$ 1,642
Short-term debt	1,833	2,493
Long-term debt:
Total long-term debt	4,267	3,871
Total debt	6,100	6,364
NYSE Notes (2.00% senior unsecured notes due October 5, 2017)
Debt Instrument [Line Items]
Short-term debt	$ 0	851
Long-term debt:
Interest rate, stated percentage	2.00%
2018 Senior Notes (2.50% senior unsecured notes due October 15, 2018)
Debt Instrument [Line Items]
Shot-term debt	$ 600	0
Long-term debt:
Senior notes	$ 0	598
Interest rate, stated percentage	2.50%
2020 Senior Notes (2.75% senior unsecured notes due December 1, 2020)
Long-term debt:
Senior notes	$ 1,240	1,242
Interest rate, stated percentage	2.75%
2022 Senior Notes (2.35% senior unsecured notes due September 15, 2022)
Long-term debt:
Senior notes	$ 495	0
Interest rate, stated percentage	2.35%
2023 Senior Notes (4.00% senior unsecured notes due October 15, 2023)
Long-term debt:
Senior notes	$ 791	790
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	1,241
Interest rate, stated percentage	3.75%
2027 Senior Notes (3.10% senior unsecured notes due September 15, 2027)
Long-term debt:
Senior notes	$ 495	$ 0
Interest rate, stated percentage	3.10%

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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.

+ References

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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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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Carrying value as of the balance sheet date of the portion of long-term, uncollateralized debt obligations due within one year or the normal operating cycle, if longer.

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Carrying value as of the balance sheet date of uncollateralized debt obligation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

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