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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

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