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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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