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Short And Long-Term Debt Loss on the Early Extinguishment of Debt (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Debt Disclosure [Abstract]        
Gain (Loss) on Extinguishment of Debt [1] $ (1) $ (8) $ (18) $ (8)
Write off of Deferred Debt Issuance Cost     $ 1  
[1] Former parent legacy items and Loss on the early extinguishment of debt are recorded in Corporate and Other