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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2020
Fair Value Disclosures [Abstract]  
Fair Values of Certain Financial Liabilities and Other Financial Instruments The fair value of certain financial liabilities is shown below (in millions):

 

 

 

December 31, 2020

 

 

December 31, 2019

 

 

 

Carrying

Amount

 

 

Fair Value

 

 

Carrying

Amount

 

 

Fair Value

 

Financial liabilities

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Senior notes (Level 1)

 

$

3,065

 

 

$

3,284

 

 

$

2,776

 

 

$

2,953

 

Credit facility (Level 2)

 

 

2,471

 

 

 

2,483

 

 

 

989

 

 

 

1,000