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Other Operating (Income) Expenses, Net (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2019
Other Income and Expenses [Abstract]          
Special charges, net $ (7) $ 28 $ 242 $ 50  
(Gain) loss on disposal of assets, net (2) (14) 42 (27)  
Other operating expenses, net $ (9) $ 14 284 $ 23  
Loss Contingency, Damages Awarded, Value     $ 220   $ 151