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Summary of Significant Accounting Policies Other long-term liabilities (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Other long term liabilities [Abstract]    
Asset Retirement Obligation, Current $ 10,000,000 $ 11,000,000
Unrecognized Tax Benefits 9,000,000 37,000,000
Liability, Retirement and Postemployment Benefits 9,000,000 9,000,000
Liability, Pension and Other Postretirement and Postemployment Benefits, Noncurrent 17,000,000 23,000,000
Long-term portion of warranty reserves 6,000,000 6,000,000
Other long term liabilities 35,000,000 39,000,000
Other long-term liabilities $ 86,000,000 $ 125,000,000