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Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2019
Fair Value Disclosures [Abstract] |
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments | The fair values of our fixed rate notes were estimated using quoted market prices for these instruments. The fair value of our commercial paper includes a discount and other short-term debt approximates par value since the interest rates on this short-term debt approximate market rates as of September 30, 2019.
| As of September 30, 2019
| (in millions)
Debt: | Carrying Amount |  | Fair value
Commercial Paper | $ | 1,318 |  |  | $ | 1,323 |
Other short-term debt | 11 |  |  | 11 |
2020 Senior Notes (2.75% senior unsecured notes due December 1, 2020) | 1,247 |  |  | 1,260 |
2022 Senior Notes (2.35% senior unsecured notes due September 15, 2022) | 497 |  |  | 505 |
2023 Senior Notes (3.45% senior unsecured notes due September 21, 2023) | 397 |  |  | 419 |
2023 Senior Notes (4.00% senior unsecured notes due October 15, 2023) | 794 |  |  | 855 |
2025 Senior Notes (3.75% senior unsecured notes due December 1, 2025) | 1,244 |  |  | 1,349 |
2027 Senior Notes (3.10% senior unsecured notes due September 15, 2027) | 496 |  |  | 524 |
2028 Senior Notes (3.75% senior unsecured notes due September 21, 2028) | 592 |  |  | 660 |
2048 Senior Notes (4.25% senior unsecured notes due September 21, 2048) | 1,229 |  |  | 1,493 |
Total debt | $ | 7,825 |  |  | $ | 8,399 |

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- Definition Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements. + References No definition available. + Details
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