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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Accounting Policies [Abstract]      
Accounts receivable $ (473) $ 541 $ (948)
Accounts receivable from related companies (69) 162 24
Inventories (117) 282 58
Other current assets (117) (7) (38)
Other non-current assets, net (78) (92) 84
Accounts payable 146 (766) 712
Accounts payable to related companies (32) (202) (178)
Accrued and other current liabilities (44) 382 (97)
Other non-current liabilities (186) 28 106
Derivative assets and liabilities, net 218 (53) 9
Net change in operating assets and liabilities, net of effects of acquisitions $ (518) $ 289 $ (192)