Quarterly report pursuant to Section 13 or 15(d)

Revenue Recognition - Narratives (Details)

v3.21.2
Revenue Recognition - Narratives (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Revenue from Contract with Customer [Abstract]          
Allowance for credit losses, period increase (decrease) $ 8   $ 15    
Allowance for credit losses 123   123   $ 138
Provisions for doubtful receivables 39 $ 84 80 $ 153  
Contract assets 314   314   279
Deferred revenue 375   375   279
Contract with Customer, Liability, Current 9   9   21
Contract with Customer, Liability, Noncurrent $ 25   $ 25   $ 26