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Other noncurrent liabilities (Tables)
 3 Months Ended
Mar. 31, 2017
Change of asset retirement obligations [Abstract]  
Other Noncurrent Liabilities [Table Text Block]
 
March 31,
2017
 
December 31, 2016
 
(in millions)
Accrued straight-line rent
$
11

 
$
10

Reserve for underground storage tank removal
58

 
53

Reserve for environmental remediation, long-term
33

 
35

Unfavorable lease liability
28

 
30

Others
48

 
36

Total
$
178

 
$
164
Schedule of Change in Asset Retirement Obligation [Table Text Block]
 
March 31,
2017
 
December 31, 2016
 
(in millions)
Accrued straight-line rent
$
11

 
$
10

Reserve for underground storage tank removal
58

 
53

Reserve for environmental remediation, long-term
33

 
35

Unfavorable lease liability
28

 
30

Others
48

 
36

Total
$
178

 
$
164