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Revenues and Segment Information, Contract Balances (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Receivables from contracts with customers, included in receivables, net
Beginning balance	$ 8,094
Decrease	(3,300)
Ending balance	4,854	$ 8,094
Contract liabilities, included in accrued expenses
Beginning balance	55
Decrease	0
Ending balance	55	55
Contract Balances (Textual)
Revenue recognized that was included in contract liabilities as of prior year end	50	31	$ 54
Receivables from Contracts with Customers [Member]
Receivables from contracts with customers, included in receivables, net
Beginning balance	5,610
Decrease	(1,968)
Ending balance	$ 3,642	$ 5,610

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
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- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

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- Definition

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.

+ References

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- Definition

The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services.

+ References

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- Definition

Amount of increase (decrease) in obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- References

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- Definition

Change in Contract with Customer, Liability [Roll Forward]

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- Definition

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+ References

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