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Financial Instruments - Fair Value Hierarchy Levels of Assets and Liabilities Value on Nonrecurring Basis (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Property, plant and equipment, losses $ 163 $ 163  
Fair Value, Nonrecurring | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Property, plant and equipment, fair value   107 $ 0
Other intangible assets, fair value   0 0
Property, plant and equipment, losses   163 0
Other intangible assets, losses   $ 92 $ 0