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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2018
Fair Value Disclosures [Abstract]  
Fair Value of Financial Assets and Liabilities
The fair values of certain financial instruments and the hierarchy level we used to estimate the fair values are shown below; see Note 11: "Derivative Instruments and Hedging Activities" for the fair value information of our derivatives and Note 15: "Employee Benefit Plans" for fair value information of our pension assets:
 
December 31, 2018
 
 
 
Hierarchy Level
 
Carrying Value
 
Level 1
 
Level 2
 
Level 3
 
(in millions)
Assets:
 
 
 
 
 
 
 
Cash equivalents
$
87

 
$
—

 
$
87

 
$
—

Restricted cash equivalents
18

 
—

 
18

 
—

Liabilities:
 
 
 
 
 
 
 
Long-term debt(1)
7,040

 
3,809

 
—

 
3,039


 
December 31, 2017
 
 
 
Hierarchy Level
 
Carrying Value
 
Level 1
 
Level 2
 
Level 3
 
(in millions)
Assets:
 
 
 
 
 
 
 
Cash equivalents
$
284

 
$
—

 
$
284

 
$
—

Restricted cash equivalents
12

 
—

 
12

 
—

Liabilities:
 
 
 
 
 
 
 
Long-term debt(1)
6,348

 
2,575

 
—

 
3,954


____________
(1) 
The carrying values include unamortized deferred financing costs and discount. The carrying values and fair values exclude capital lease obligations and other debt.