Credit Facilities and Debt (Summary of Debt Outstanding) (Details) - USD ($) $ in Millions		Jun. 30, 2020	Dec. 31, 2019
Credit Facilities and Long-Term Debt :
Debt issuance costs and unamortized discount	[1]	$ (31)	$ (17)
Total debt		3,243	2,316
Less: short-term borrowings and current maturities of long-term debt		212	276
Long-term debt		3,031	2,040
Senior Notes Due Twenty Twenty Eight
Credit Facilities and Long-Term Debt :
Senior Notes Due		500	0
Long-term Debt, Fair Value		504
Senior Notes Due Twenty Thirty One
Credit Facilities and Long-Term Debt :
Senior Notes Due		500	0
Long-term Debt, Fair Value		503
Senior Notes Due 2021, 4.875%
Credit Facilities and Long-Term Debt :
Senior Notes Due	[2]	600	600
Long-term Debt, Fair Value		630	629
Senior Notes Due 2023, 2.250%
Credit Facilities and Long-Term Debt :
Senior Notes Due	[2]	562	557
Long-term Debt, Fair Value		582	591
Senior Notes due 2026
Credit Facilities and Long-Term Debt :
Senior Notes Due	[2]	500	500
Long-term Debt, Fair Value		551	518
Senior Notes due 2046
Credit Facilities and Long-Term Debt :
Senior Notes Due	[2]	400	400
Long-term Debt, Fair Value		439	431
Commercial paper
Credit Facilities and Long-Term Debt :
Senior Notes Due		50	276
Other
Credit Facilities and Long-Term Debt :
Senior Notes Due		$ 162	$ 0

[1] The debt issuance costs and unamortized discount are recognized as a reduction in the carrying value of the Senior Notes in the Condensed Consolidated Balance Sheets and are being amortized to interest expense in our Condensed Consolidated Income Statements over the expected remaining terms of the Senior Notes.

[2] The fair value of our Senior Notes was determined using quoted prices in active markets for identical securities, which are considered Level 1 inputs. The fair value of our Senior Notes due 2021 was $630 million and $629 million as of June 30, 2020 and December 31, 2019, respectively. The fair value of our Senior Notes due 2023 was $582 million and $591 million as of June 30, 2020 and December 31, 2019, respectively. The fair value of our Senior Notes due 2026 was $551 million and $518 million as of June 30, 2020 and December 31, 2019, respectively. The fair value of our Senior Notes due 2046 was $439 million and $431 million as of June 30, 2020 and December 31, 2019, respectively.