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Other Income and Expense - Other Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Schedule of Other Nonoperating Income (Expense) [Line Items] |  |  |  |
Gain (Loss) on Disposition of Assets |  |  | $ (23) | $ (19)
Allowance for Funds Used During Construction, Capitalized Interest | $ 5 | $ 4 | 12 | 6
Other Nonoperating Income | 7 | 5 | 19 | 19
Other Income | 13 | 12 | 43 | 56
Other Income [Member] |  |  |  |
Schedule of Other Nonoperating Income (Expense) [Line Items] |  |  |  |
Gain (Loss) on Disposition of Assets | 1 | 3 | 12 | 13
Altai [Domain] |  |  |  |
Schedule of Other Nonoperating Income (Expense) [Line Items] |  |  |  |
Reversal Of Legal Contingency | $ 0 | $ 0 | $ 0 | $ 18

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- Definition Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=51824106&loc=d3e2443-110228 + Details
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- Definition Reflects the sum of all other revenue and income recognized by the entity in the period not otherwise specified in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.4) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details
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