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Credit Facilities and Long-Term Debt (Summary of Debt Outstanding) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Jun. 26, 2020 | Oct. 11, 2016 | Sep. 20, 2011
--- | --- | --- | --- | --- | ---
Credit Facilities and Long-Term Debt : |  |  |  |  |
Debt issuance costs and unamortized discount | $ (24) | $ (28) |  |  |
Total debt | 2,440 | 3,084 |  |  |
Less: short-term borrowings and current maturities of long-term debt | 0 | 600 |  |  |
Long-term debt, net | $ 2,440 | 2,484 |  |  |
4.875% Senior Notes Due 2021 |  |  |  |  |
Credit Facilities and Long-Term Debt : |  |  |  |  |
Interest rate | 4.875% |  |  |  | 4.875%
Outstanding balances | $ 0 | 600 |  |  |
2.250% Senior Notes Due 2023 |  |  |  |  |
Credit Facilities and Long-Term Debt : |  |  |  |  |
Interest rate | 2.25% |  |  |  |
Outstanding balances | $ 564 | 612 |  |  |
Debt fair value | $ 577 | 640 |  |  |
3.250% Senior Notes Due 2026 |  |  |  |  |
Credit Facilities and Long-Term Debt : |  |  |  |  |
Interest rate | 3.25% |  |  | 3.25% |
Outstanding balances | $ 500 | 500 |  |  |
Debt fair value | $ 537 | 563 |  |  |
Senior Notes Due Twenty Twenty Eight |  |  |  |  |
Credit Facilities and Long-Term Debt : |  |  |  |  |
Interest rate | 1.95% |  | 1.95% |  |
Outstanding balances | $ 500 | 500 |  |  |
Senior Notes Due Twenty Thirty One |  |  |  |  |
Credit Facilities and Long-Term Debt : |  |  |  |  |
Interest rate | 2.25% |  | 2.25% |  |
Outstanding balances | $ 500 | 500 |  |  |
4.375% Senior Notes Due 2046 |  |  |  |  |
Credit Facilities and Long-Term Debt : |  |  |  |  |
Interest rate | 4.375% |  |  | 4.375% |
Outstanding balances | $ 400 | 400 |  |  |
Debt fair value | 481 | 496 |  |  |
Level 1 | 4.875% Senior Notes Due 2021 |  |  |  |  |
Credit Facilities and Long-Term Debt : |  |  |  |  |
Debt fair value | 0 | 620 |  |  |
Level 1 | Senior Notes Due Twenty Twenty Eight |  |  |  |  |
Credit Facilities and Long-Term Debt : |  |  |  |  |
Debt fair value | 497 | 529 |  |  |
Level 1 | Senior Notes Due Twenty Thirty One |  |  |  |  |
Credit Facilities and Long-Term Debt : |  |  |  |  |
Debt fair value | $ 496 | $ 527 |  |  |

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