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Investments In and Advances To Affiliates - Summarized Financial Information (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 15, 2017 | Jul. 25, 2017 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  | $ 2,643 | $ 2,693 | $ 2,613 | $ 2,581 | $ 2,660 | $ 2,639 | $ 2,452 | $ 2,530 | $ 10,530 | $ 10,281 | $ 11,260
Operating margin |  |  | 643 | 642 | 625 | 554 | 632 | 691 | 556 | 501 | 2,464 | 2,380 | 2,663
Net income (loss) |  |  | (1,286) | $ 261 | $ 150 | $ 98 | (693) | $ 229 | $ (387) | $ 74 | (777) | (777) | 762
Assets, Current |  |  | 6,398 |  |  |  | 6,416 |  |  |  | 6,398 | 6,416 |
Liabilities, Current |  |  | 6,028 |  |  |  | 5,277 |  |  |  | 6,028 | 5,277 |
Liabilities, Noncurrent |  |  | 21,402 |  |  |  | 24,365 |  |  |  | 21,402 | 24,365 |
Stockholders' Equity Attributable to Noncontrolling Interest |  |  | 2,380 |  |  |  | 2,906 |  |  |  | 2,380 | 2,906 |
Stockholders' Equity Attributable to Parent |  |  | 2,465 |  |  |  | 2,794 |  |  |  | 2,465 | 2,794 |
Undistributed Earnings Of Minority Owned Affiliates Included In Retained Earnings |  |  | 254 |  |  |  |  |  |  |  | 254 |  |
Distributions Received From Minority Owned Affiliates |  |  |  |  |  |  |  |  |  |  | 69 | 24 | 18
Basis Difference Between Carrying Amount And Investment |  |  | 46 |  |  |  |  |  |  |  | 46 |  |
Minority Owned Affiliates |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  | 762 | 586 | 641
Operating margin |  |  |  |  |  |  |  |  |  |  | 165 | 145 | 152
Net income (loss) |  |  |  |  |  |  |  |  |  |  | 72 | 64 | 210
Assets, Current |  |  | 418 |  |  |  | 308 |  |  |  | 418 | 308 |
Assets, Noncurrent |  |  | 5,372 |  |  |  | 2,577 |  |  |  | 5,372 | 2,577 |
Liabilities, Current |  |  | 633 |  |  |  | 626 |  |  |  | 633 | 626 |
Liabilities, Noncurrent |  |  | 2,629 |  |  |  | 1,209 |  |  |  | 2,629 | 1,209 |
Stockholders' Equity Attributable to Parent |  |  | 2,527 |  |  |  | 1,048 |  |  |  | 2,527 | 1,048 |
Majority Owned Affiliates |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  | 16 | 23 | 24
Operating margin |  |  |  |  |  |  |  |  |  |  | 5 | 9 | 11
Net income (loss) |  |  |  |  |  |  |  |  |  |  | (15) | (2) | $ 6
Assets, Current |  |  | 70 |  |  |  | 16 |  |  |  | 70 | 16 |
Assets, Noncurrent |  |  | 102 |  |  |  | 181 |  |  |  | 102 | 181 |
Liabilities, Current |  |  | 10 |  |  |  | 10 |  |  |  | 10 | 10 |
Liabilities, Noncurrent |  |  | 147 |  |  |  | 122 |  |  |  | 147 | 122 |
Stockholders' Equity Attributable to Parent |  |  | $ 15 |  |  |  | $ 65 |  |  |  | $ 15 | $ 65 |
sPower [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired | $ 19 | $ 461 |  |  |  |  |  |  |  |  |  |  |

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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(31)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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