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Asset Impairment, Exit and Implementation Costs (Restructuring Liabilities) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Restructuring Reserve [Roll Forward]    
Balance at beginning of period $ 155 $ 33
Charges 59 154
Cash spent (147) (32)
Balance at end of period $ 67 $ 155