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Balance Sheet and Cash Flows Supplemental Information - Additional Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Supplemental non cash information:      
Operating activities - MGT sales made to AMIC $ 3 $ 4 $ 0
Financing activities - Acquisition of noncontrolling interest 0 125 0
Capital expenditures acquired but not yet paid 72 75 37
Hawkins Point Land      
Supplemental non cash information:      
Operating activities - reduction of Hawkins Point environmental obligation 12 0 0
Investing activities - sale of Hawkins Point land 12 0 0
MGT Loan      
Supplemental non cash information:      
Operating activities - Interest expense on MGT loan 1 1 0
Financing activities - Repayment of MGT loan 3 3 0
Financing activities - Initial commercial insurance premium financing agreement 21 0 0
MGT Acquisition      
Supplemental non cash information:      
Investing activities - Acquisition of MGT assets 0 0 36
Financing activities - debt assumed in the acquisition of MGT assets $ 0 $ 0 $ 36