Basis of Presentation - Changes in Allowances for Credit Losses (Details) $ in Millions	9 Months Ended
Sep. 30, 2020 USD ($)
Allowance for Trade Receivables
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at January 1, 2020	$ (35)
Current period provision for expected credit losses	(9)
Write-offs charged against the allowance	1
Currency	2
Balance at September 30, 2020	(41)
Allowance for Other Current Receivables
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at January 1, 2020	(44)
Current period provision for expected credit losses	(1)
Write-offs charged against the allowance	2
Currency	3
Balance at September 30, 2020	(40)
Allowance for Long-Term Receivables
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at January 1, 2020	(14)
Current period provision for expected credit losses	(2)
Write-offs charged against the allowance	0
Currency	5
Balance at September 30, 2020	$ (11)

Accounts Receivable, Allowance for Credit Loss, Foreign Currency Translation And Other

No definition available.

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- Definition

Amount of allowance for credit loss on accounts receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5074-111524

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121599878&loc=SL82895884-210446

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Amount of direct write-downs of accounts receivable charged against the allowance.

+ References

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- Definition

Amount of expense (reversal of expense) for expected credit loss on accounts receivable.

+ References

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