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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
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accounting Policies [Abstract]      
Accounts receivable $ (948) $ (1,126) $ 856
Accounts receivable from related companies 24 42 (5)
Inventories 58 (480) (212)
Other current assets (38) (165) 225
Other non-current assets, net 84 (148) 247
Accounts payable 712 1,170 (1,070)
Accounts payable to related companies (178) (64) 400
Accrued and other current liabilities (97) 89 (697)
Other non-current liabilities 106 106 (241)
Derivative assets and liabilities, net 9 67 75
Net change in operating assets and liabilities, net of effects of acquisitions $ (192) $ (179) [1] $ (872) [1]
[1] * As adjusted. See Note 2.