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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2017
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):

 

 

 

June 30, 2017

 

 

December 31, 2016

 

 

 

Carrying

Amount

 

 

Fair Value

 

 

Carrying

Amount

 

 

Fair Value

 

Financial liabilities

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Senior notes (Level 1)

 

$

2,776

 

 

$

2,939

 

 

$

2,380

 

 

$

2,477

 

Credit facility (Level 2)

 

 

1,215

 

 

 

1,224

 

 

 

1,206

 

 

 

1,211

 

Mortgage debt and other, excluding capital leases

      (Level 2)

 

 

—

 

 

 

—

 

 

 

62

 

 

 

62