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Restructuring and Other Charges - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]      
Integration activities charges $ 118 $ 303 $ 56
Non-cash impairment charge 15 124 48
Accelerated amortization expense included within finance lease expense   62  
Accelerated amortization expense   56  
Employee Termination Costs      
Restructuring Cost and Reserve [Line Items]      
Employee termination costs 95 131 32
Employee severance and other separation costs accrual 36 27 14
Share-based compensation costs $ 8 $ 48 $ 23