Revenue Recognition - Reconciliation of Contract Balances (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Reconciliation of Contract Balances
Notes and accounts receivable - trade (net of allowances of $213 in 2022 and $218 in 2021)	$ 5,867	$ 5,867	$ 6,754
Notes and accounts receivable - trade, allowances	213	213	218
Contract assets	531	531	471
Deferred income (current)	12,522	12,522	12,518
Deferred income (noncurrent)	3,069	3,069	$ 3,577
Revenue recognized that was included in deferred income at the beginning of the period	$ 4,400	$ 6,800

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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Amount of allowance for credit loss on accounts receivable, classified as current.

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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current.

+ References

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Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

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Amount of deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable, classified as current.

+ References

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Amount of deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable, classified as noncurrent.

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