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Debt (Tables)
3 Months Ended
Mar. 31, 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 March 31, 2021 and December 31, 2020 were as follows:

In millionsMarch 31, 2021December 31, 2020
Fair value$8,880 $9,412 
Carrying value7,949 8,122