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Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Supplemental Cash Flow Information [Abstract]    
Cash payments for interest, net of amounts capitalized $ (261) $ (260)
Cash receipts for income taxes, net of payments   13
Non-cash dividends to non-controlling interests in subsidiary (74)  
Partnership Contributions Receivable $ 15  
Non-cash Investment segment contributions from non-controlling interests   $ 1,240