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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2018
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, 2018

 

 

December 31, 2017

 

 

 

Carrying

Amount

 

 

Fair Value

 

 

Carrying

Amount

 

 

Fair Value

 

Financial liabilities

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Senior notes (Level 1)

 

$

2,782

 

 

$

2,808

 

 

$

2,778

 

 

$

2,932

 

Credit facility (Level 2)

 

 

1,049

 

 

 

1,055

 

 

 

1,170

 

 

 

1,178

 

Other debt, excluding capital leases

      (Level 2)

 

 

5

 

 

 

5

 

 

 

5

 

 

 

5