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Business Optimization Charges - Summary of Business Optimization Charges (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Restructuring Cost and Reserve [Line Items]        
Restructuring charges $ 7 $ 52 $ 32 $ 77
Business Optimization Programs        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges 7 52 32 77
Costs to implement business optimization programs 6 12 13 22
Accelerated depreciation 0 1 0 4
Total business optimization charges $ 13 $ 65 $ 45 $ 103