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Restructuring and Other Charges - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]      
Integration activities charges $ 303 $ 56  
Non-cash impairment charges 124 48 $ 3
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 131 32  
Employee severance and other separation costs accrual 27 14 $ 0
Share-based compensation costs $ 48 $ 23