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Investments In and Advances To Affiliates - Summarized Financial Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 14,963 | $ 17,146 | $ 15,891
Operating margin | $ 718 | $ 673 | $ 754 | $ 721 | $ 708 | $ 767 | $ 819 | $ 794 | 2,866 | 3,088 | 3,247
Net income | 41 | $ 203 | $ 264 | $ 254 | 298 | $ 508 | $ 275 | $ 66 | 762 | 1,147 | 551
Assets, Current | 6,866 |  |  |  | 7,826 |  |  |  | 6,866 | 7,826 |
Liabilities, Current | 6,950 |  |  |  | 6,997 |  |  |  | 6,950 | 6,997 |
Liabilities, Noncurrent | 23,191 |  |  |  | 24,566 |  |  |  | 23,191 | 24,566 |
Stockholders' Equity Attributable to Noncontrolling Interest | 3,022 |  |  |  | 3,053 |  |  |  | 3,022 | 3,053 |
Stockholders' Equity Attributable to Parent | 3,149 |  |  |  | 4,272 |  |  |  | 3,149 | 4,272 |
Undistributed Earnings Of Minority Owned Affiliates Included In Retained Earnings | 244 |  |  |  |  |  |  |  | 244 |  |
Distributions Received From Minority Owned Affiliates |  |  |  |  |  |  |  |  | 18 | 28 | 6
Basis Difference Between Carrying Amount And Investment | 162 |  |  |  |  |  |  |  | 162 |  |
Minority Owned Affiliates |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 641 | 928 | 1,099
Operating margin |  |  |  |  |  |  |  |  | 152 | 206 | 295
Net income |  |  |  |  |  |  |  |  | 210 | 59 | 53
Assets, Current | 376 |  |  |  | 450 |  |  |  | 376 | 450 |
Assets, Noncurrent | 2,132 |  |  |  | 1,748 |  |  |  | 2,132 | 1,748 |
Liabilities, Current | 435 |  |  |  | 299 |  |  |  | 435 | 299 |
Liabilities, Noncurrent | 1,044 |  |  |  | 935 |  |  |  | 1,044 | 935 |
Stockholders' Equity Attributable to Noncontrolling Interest | 0 |  |  |  | 17 |  |  |  | 0 | 17 |
Stockholders' Equity Attributable to Parent | 1,029 |  |  |  | 947 |  |  |  | 1,029 | 947 |
Majority Owned Affiliates |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 24 | 2 | 2
Operating margin |  |  |  |  |  |  |  |  | 11 | 0 | 0
Net income |  |  |  |  |  |  |  |  | 6 | 0 | $ 0
Assets, Current | 20 |  |  |  | 0 |  |  |  | 20 | 0 |
Assets, Noncurrent | 211 |  |  |  | 15 |  |  |  | 211 | 15 |
Liabilities, Current | 21 |  |  |  | 0 |  |  |  | 21 | 0 |
Liabilities, Noncurrent | 153 |  |  |  | 67 |  |  |  | 153 | 67 |
Stockholders' Equity Attributable to Noncontrolling Interest | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Stockholders' Equity Attributable to Parent | $ 57 |  |  |  | $ (52) |  |  |  | $ 57 | $ (52) |

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