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Revenue Recognition - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Revenue from Contract with Customer [Abstract]        
Lease income $ 329 $ 332 $ 988 $ 998
Percent of operating revenue 7.00% 6.00% 7.00% 6.00%
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Revenue recognized $ 61 $ 58 $ 544 $ 612
Minimum        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Contract term     1 year  
Maximum        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Contract term     5 years  
Weighted Average | Consumer Customers        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Length of customer life     30 months  
Weighted Average | Business Customers        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Length of customer life     30 months