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Regulatory Matters, Commitments, Contingencies And Environmental Liabilities (Tables)
 3 Months Ended
Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Rent Expense [Table Text Block]
We have certain non-cancelable leases for property and equipment, which require fixed monthly rental payments and expire at various dates through 2058. The table below reflects rental expense under these operating leases included in operating expenses in the accompanying statements of operations, which include contingent rentals, and rental expense recovered through related sublease rental income:
 
Three Months Ended
March 31,
 
2015
 
2014
Rental expense(1)
$
47

 
$
31

Less: Sublease rental income
(8
)
 
(8
)
Rental expense, net
$
39

 
$
23

(1) 
Includes contingent rentals totaling $4 million and $3 million for the three months ended March 31, 2015 and 2014, respectively.
Environmental Exit Costs by Cost [Table Text Block]
 
March 31, 2015
 
December 31, 2014
Current
$
46

 
$
39

Non-current
333

 
352

Total environmental liabilities
$
379

 
$
391