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Debt and Lines of Credit - Schedule of Long-term Debt Outstanding (Details) - USD ($) $ in Millions	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Debt, gross	$ 5,100		$ 4,100
Net unamortized discounts, premiums and debt issuance costs	(33)		(23)
Total debt, including net unamortized discounts, premiums and debt issuance costs	5,067		4,077
Current portion of long-term debt	(749)		(500)
Long-term debt	4,318		3,577
Notes due 2018 at 1.00%
Debt Instrument [Line Items]
Debt, gross	0		500
Notes due 2019 at 1.65%
Debt Instrument [Line Items]
Debt, gross	750		750
Notes due 2020 at 1.75%
Debt Instrument [Line Items]
Debt, gross	500		500
Notes due 2021 at 2.75%
Debt Instrument [Line Items]
Debt, gross	550		550
Notes due 2022 at 1.85%
Debt Instrument [Line Items]
Debt, gross	500		500
Notes due 2023 at 2.25%
Debt Instrument [Line Items]
Debt, gross	500		500
Notes due 2024 at 2.625%
Debt Instrument [Line Items]
Debt, gross	300		300
Notes due 2027 at 2.90%
Debt Instrument [Line Items]
Debt, gross	500		500
Notes due 2048 at 4.15%
Debt Instrument [Line Items]
Debt, gross	$ 1,500	$ 1,500	$ 0