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Revenue Recognition - Reconciliation of Contract Balances (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Reconciliation of Contract Balances    
Notes and accounts receivable - trade (net of allowances of $337 in 2020 and $299 in 2019) $ 6,927 $ 7,870
Notes and accounts receivable - trade, allowances 337 299
Contract assets 488 492
Deferred income (current) 13,377 12,026
Deferred income (noncurrent) 3,769 $ 3,851
Revenue recognized that was included in deferred income at the beginning of the period $ 4,200