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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounting Policies [Abstract]      
Accounts receivable $ 1,163 $ (473) $ 541
Accounts receivable from related companies (290) (69) 162
Inventories (271) (19) 237
Other current assets (172) (117) (7)
Other non-current assets, net (7) (102) (102)
Accounts payable (1,327) 146 (766)
Accounts payable to related companies 367 (32) (202)
Accrued and other current liabilities 163 (44) 382
Other non-current liabilities 8 (133) 28
Derivative assets and liabilities, net 69 218 (53)
Net change in operating assets and liabilities, net of effects of acquisitions $ 47 $ (391) $ 234