Financing Arrangements (Summary of Debt) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long-term debt, including current maturities	$ 4,993	$ 4,768
Less current maturities	947	376
Total long-term debt	4,046	4,392
Senior note - 4.50%, maturing 2018
Debt Instrument [Line Items]
Long-term debt, including current maturities	$ 0	363
Stated interest rate	4.50%
Senior note - 2.40%, maturing 2019
Debt Instrument [Line Items]
Long-term debt, including current maturities	$ 250	250
Stated interest rate	2.40%
Senior note - 1.00%, maturing 2019
Debt Instrument [Line Items]
Long-term debt, including current maturities	$ 687	0
Stated interest rate	1.00%
Senior note - 0.625% maturing 2020
Debt Instrument [Line Items]
Long-term debt, including current maturities	$ 572	599
Stated interest rate	0.625%
Senior note - 4.85%, maturing 2021
Debt Instrument [Line Items]
Long-term debt, including current maturities	$ 300	300
Stated interest rate	4.85%
Senior note - 4.70%, maturing 2022
Debt Instrument [Line Items]
Long-term debt, including current maturities	$ 300	300
Stated interest rate	4.70%
Senior note - 3.70%, maturing 2023
Debt Instrument [Line Items]
Long-term debt, including current maturities	$ 250	250
Stated interest rate	3.70%
Senior note - 4.00%, maturing 2024
Debt Instrument [Line Items]
Long-term debt, including current maturities	$ 300	300
Stated interest rate	4.00%
Senior note - 3.70%, maturing 2025
Debt Instrument [Line Items]
Long-term debt, including current maturities	$ 350	350
Stated interest rate	3.70%
Senior note - 1.25% maturing 2026
Debt Instrument [Line Items]
Long-term debt, including current maturities	$ 567	594
Stated interest rate	1.25%
Senior note - 1.10% maturing 2027
Debt Instrument [Line Items]
Long-term debt, including current maturities	$ 681	713
Stated interest rate	1.10%
Senior note - 5.15% maturing 2043
Debt Instrument [Line Items]
Long-term debt, including current maturities	$ 250	249
Stated interest rate	5.15%
Senior note - 4.50% maturing 2046
Debt Instrument [Line Items]
Long-term debt, including current maturities	$ 496	496
Stated interest rate	4.50%
Other, net
Debt Instrument [Line Items]
Long-term debt, including current maturities	$ (10)	$ 4

Contractual interest rate for funds borrowed, under the debt agreement.

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