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Credit Facilities and Debt (Summary of Debt Outstanding) (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Credit Facilities and Long-Term Debt : |  |  |
Debt issuance costs and unamortized discount | [1] | $ (16) | $ (17)
Total debt |  | 2,490 | 2,316
Less: short-term borrowings and current maturities of long-term debt |  | 459 | 276
Long-term debt |  | 2,031 | 2,040
Senior Notes Due 2021, 4.875% |  |  |
Credit Facilities and Long-Term Debt : |  |  |
Senior Notes Due | [2] | 600 | 600
Senior Notes Due 2023, 2.250% |  |  |
Credit Facilities and Long-Term Debt : |  |  |
Senior Notes Due | [2] | 547 | 557
Senior Notes due 2026 |  |  |
Credit Facilities and Long-Term Debt : |  |  |
Senior Notes Due | [2] | 500 | 500
Senior Notes due 2046 |  |  |
Credit Facilities and Long-Term Debt : |  |  |
Senior Notes Due | [2] | 400 | 400
Commercial paper |  |  |
Credit Facilities and Long-Term Debt : |  |  |
Senior Notes Due |  | 268 | 276
Other |  |  |
Credit Facilities and Long-Term Debt : |  |  |
Senior Notes Due |  | $ 191 | $ 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 $640 million and $629 million as of March 31, 2020 and December 31, 2019, respectively. The fair value of our Senior Notes due 2023 was $565 million and $591 million as of March 31, 2020 and December 31, 2019, respectively. The fair value of our Senior Notes due 2026 was $533 million and $518 million as of March 31, 2020 and December 31, 2019, respectively. The fair value of our Senior Notes due 2046 was $400 million and $431 million as of March 31, 2020 and December 31, 2019, respectively.

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