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Cash And Cash Equivalents Net Change in Operating Assets and Liabilities (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Supplemental Cash Flow Elements [Abstract]          
Accounts receivable   $ 2,084 $ (340)    
Accounts receivable from related companies   111 (1)    
Inventories   (180) 28    
Other current assets   146 30    
Other non-current assets, net   (226) (44)    
Accounts payable   (2,108) 199    
Accounts payable to related companies   (8) (49)    
Accrued and other current liabilities   (116) (89)    
Other non-current liabilities   42 (87)    
Derivative assets and liabilities, net   190 140    
Net change in operating assets and liabilities, net of effects of acquisitions $ (66) $ 65 $ 213 [1] $ 444 $ (234)
[1]
*As adjusted. See Note 1.