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Debt (Tables)
 6 Months Ended
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 millionsJune 30, 2021December 31, 2020
Fair value$8,649 $9,412 
Carrying value7,648 8,122