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Estimates (Schedule Of Net Changes In Operating Assets And Liabilities Included Cash Flows From Operating Activities) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Accounting Policies [Abstract] |  |  |
Accounts receivable | $ (1,126) | $ 856 | $ 600
Accounts receivable from related companies | 42 | (5) | 30
Inventories | (345) | (410) | 52
Other current assets | (149) | 225 | (151)
Other non-current assets, net | (148) | 250 | (6)
Accounts payable | 1,214 | (1,043) | (893)
Accounts payable to related companies | (64) | 400 | 5
Exchanges payable | 0 | 0 | 0
Accrued and other current liabilities | 89 | (697) | (158)
Other non-current liabilities | 158 | (233) | (138)
Derivative assets and liabilities, net | 67 | 75 | 19
Net change in operating assets and liabilities, net of effects of acquisitions | $ 36 | $ (1,032) | $ (338)

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