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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2021
Fair Value Disclosures [Abstract]  
Fair Values of Certain Financial Liabilities and Other Financial Instruments The fair values of financial instruments not included in this table are estimated to be equal to their carrying amounts. The fair value of certain financial liabilities is shown below (in millions):

 

 

 

December 31, 2021

 

 

December 31, 2020

 

 

 

Carrying Amount

 

 

Fair Value

 

 

Carrying Amount

 

 

Fair Value

 

Financial liabilities

 

 

 

 

 

 

 

 

 

 

 

 

Senior notes (Level 1)

 

$

3,109

 

 

$

3,255

 

 

$

3,065

 

 

$

3,284

 

Credit facility (Level 2)

 

 

1,673

 

 

 

1,683

 

 

 

2,471

 

 

 

2,483

 

Mortgage debt (Level 2)

 

 

104

 

 

 

105

 

 

 

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