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Leases (Tables)
 9 Months Ended
Sep. 30, 2014
Leases [Abstract]  
Sublease Rollforward
(in millions)
 
B717 lease/sublease liability
Balance at December 31, 2012
 
$
128

Lease/sublease accretion
 
6

Lease/sublease payments, net (a)
 
(12
)
Balance at December 31, 2013
 
$
122

Lease/sublease accretion
 
4

Lease/sublease expense adjustment
 
19

Lease/sublease payments, net (a)
 
(66
)
Balance at September 30, 2014
 
$
79


(a) Includes lease conversion cost payments