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Regulatory Matters, Commitments, Contingencies And Environmental Liabilities Regulatory Matters, Commitments, Contingencies And Environmental Liabilities (Tables)
12 Months Ended
Dec. 31, 2018
Regulatory Matters, Commitments, Contingencies And Environmental Liabilities [Abstract]  
Schedule of Rent Expense [Table Text Block]
We have certain non-cancelable leases for property and equipment, which require fixed monthly rental payments with typical initial terms of 5 to 15 years, with some having a term of 40 years or more. 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:
 
 
Years Ended December 31,
 
 
2018
 
2017
 
2016
Rental expense(1)
 
$
139

 
$
171

 
$
161

Sublease rental income(2)
 
40

 
25

 
26

Net
 
$
99

 
$
146

 
$
135

(1) 
Includes contingent rentals totaling $4 million, $16 million and $18 million for the years ended December 31, 2018, 2017 and 2016, respectively.
(2) 
Sublease rental income is included in other revenues in the accompanying statements of operations.
Environmental Exit Costs by Cost [Table Text Block]
The table below reflects the amounts of accrued liabilities recorded in our consolidated balance sheets related to environmental matters that are considered to be probable and reasonably estimable. Currently, we are not able to estimate possible losses or a range of possible losses in excess of amounts accrued. Except for matters discussed above, we do not have any material environmental matters assessed as reasonably possible that would require disclosure in our consolidated financial statements.
 
December 31,
 
2018
 
2017
Current
$
42

 
$
35

Non-current
295

 
337

Total environmental liabilities
$
337

 
$
372

Schedule of Future Minimum Rental Payments for Operating Leases
Future minimum lease commitments for such leases are:
Years Ending December 31:
 
2019
$
104

2020
95

2021
74

2022
58

2023
50

Thereafter
220

Future minimum lease commitments
601

Less: Sublease rental income
(111
)
Net future minimum lease commitments
$
490