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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2019
Fair Value Disclosures [Abstract] |
Schedule of Carrying Values and Estimated Fair Values of Debt 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 December 31, 2019 and December 31, 2018.
| As of December 31, 2019 |  | As of December 31, 2018
| (in millions) |  | (in millions)
Debt: | Carrying Amount |  | Fair value |  | Carrying Amount |  | Fair value
Commercial Paper | $ | 1,311 |  |  | $ | 1,314 |  |  | $ | 951 |  |  | $ | 953 |
Other short-term debt | 10 |  |  | 10 |  |  | — |  |  | — |
2020 Senior Notes | 1,248 |  |  | 1,259 |  |  | 1,246 |  |  | 1,244 |
2022 Senior Notes | 497 |  |  | 505 |  |  | 496 |  |  | 484 |
2023 Senior Notes | 398 |  |  | 420 |  |  | 397 |  |  | 402 |
October 2023 Senior Notes | 794 |  |  | 855 |  |  | 793 |  |  | 821 |
2025 Senior Notes | 1,244 |  |  | 1,355 |  |  | 1,243 |  |  | 1,258 |
2027 Senior Notes | 496 |  |  | 526 |  |  | 496 |  |  | 477 |
2028 Senior Notes | 592 |  |  | 657 |  |  | 591 |  |  | 599 |
2048 Senior Notes | 1,229 |  |  | 1,490 |  |  | 1,228 |  |  | 1,236 |
Total debt | $ | 7,819 |  |  | $ | 8,391 |  |  | $ | 7,441 |  |  | $ | 7,474 |

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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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