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Lease Commitments Lease Commitments (Tables)
 12 Months Ended
Dec. 31, 2014
Lease Commitments [Abstract]  
Schedule of future minimum lease payments required under operating leases
Future minimum lease payments required under operating leases with initial or remaining noncancelable terms in excess of one year as of December 31, 2014 were as follows:
(millions)
2015
 
2016
 
2017
 
2018
 
2019
 
After 2019
Future minimum lease payments
$
69

 
$
59

 
$
52

 
$
41

 
$
29

 
$
42