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Credit Facilities and Debt (Summary of Debt Outstanding) (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Credit Facilities and Long-Term Debt : |  |  |
Debt issuance costs and unamortized discount | [1] | $ (26) | $ (28)
Total debt |  | 3,066 | 3,084
Less: short-term borrowings and current maturities of long-term debt |  | 600 | 600
Long-term debt |  | 2,466 | 2,484
Senior Notes Due 2021, 4.875% |  |  |
Credit Facilities and Long-Term Debt : |  |  |
Senior Notes Due | [2] | 600 | 600
Long-term Debt, Fair Value |  | 606 | 620
Senior Notes Due 2023, 2.250% |  |  |
Credit Facilities and Long-Term Debt : |  |  |
Senior Notes Due | [2] | 592 | 612
Long-term Debt, Fair Value |  | 614 | 640
Senior Notes due 2026 |  |  |
Credit Facilities and Long-Term Debt : |  |  |
Senior Notes Due | [2] | 500 | 500
Long-term Debt, Fair Value |  | 548 | 563
Senior Notes Due Twenty Twenty Eight |  |  |
Credit Facilities and Long-Term Debt : |  |  |
Senior Notes Due |  | 500 | 500
Long-term Debt, Fair Value |  | 508 | 529
Senior Notes Due Twenty Thirty One |  |  |
Credit Facilities and Long-Term Debt : |  |  |
Senior Notes Due |  | 500 | 500
Long-term Debt, Fair Value |  | 507 | 527
Senior Notes due 2046 |  |  |
Credit Facilities and Long-Term Debt : |  |  |
Senior Notes Due | [2] | 400 | 400
Long-term Debt, Fair Value |  | $ 483 | $ 496
[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 $606 million and $620 million as of June 30, 2021 and December 31, 2020, respectively. The fair value of our Senior Notes due 2023 was $614 million and $640 million as of June 30, 2021 and December 31, 2020, respectively. The fair value of our Senior Notes due 2026 was $548 million and $563 million as of June 30, 2021 and December 31, 2020 respectively. The fair value of our Senior Notes due 2046 was $483 million and $496 million as of June 30, 2021 and December 31, 2020, respectively.(b)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 2028 was $508 million and $529 million as of June 30, 2021 and December 31, 2020, respectively. The fair value of our Senior Notes due 2031 was $507 million and $527 million as of June 30, 2021 and December 31, 2020, respectively.

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