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Debt (Tables) | 6 Months Ended
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Jun. 30, 2021
Debt Disclosure [Abstract] |
Approximate Fair Value and Related Carrying Value of Long-term Debt, Including Current Maturities | The approximate fair value and related carrying value of the Company's total long-term debt, including current maturities of long-term debt presented as short-term debt, as of June 30, 2021 and December 31, 2020 were as follows:
In millions | June 30, 2021 |  | December 31, 2020
Fair value | $ | 8,649 |  |  | $ | 9,412 |
Carrying value | 7,648 |  |  | 8,122 |

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