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Leases Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]        
Operating Lease, Payments   $ 8 $ 8 $ 7
Finance Lease, Interest Payment on Liability   11 10 5
Finance Lease, Principal Payments   6 6 4
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability   (12) 0 (56)
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability $ 141 153 0 $ 154
Lessee, Lease, Description [Line Items]        
Operating Lease, Liability, Current   4 8  
Operating Lease, Liability, Noncurrent   $ 22 $ 36  
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]   Accounts payable    
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]   Other noncurrent liabilities