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Regulatory Matters, Commitments, Contingencies And Environmental Liabilities Regulatory Matters, Commitments, Contingencies And Environmental Liabilities (Tables) | 12 Months Ended
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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 |

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- Definition REGULATORY MATTERS, COMMITMENTS, CONTINGENCIES, AND ENVIRONMENTAL LIABILITIES [Abstract] + References No definition available. + Details
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- Definition Tabular disclosure of material liabilities for remediation, site restoration, postclosure, monitoring commitments, or other exit costs that may occur on the sale, disposal or abandonment of a property as a result of unanticipated contamination of the assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.Y.Q4) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 + Details
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- Definition Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 + Details
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- Definition Tabular disclosure of rental expense from operating leases for each period for which an income statement is presented with separate amounts for minimum rentals, contingent rentals, and sublease rentals. Rental payments under leases with terms of a month or less that were not renewed need not be included. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 + Details
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