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Restructuring Charges (Reconciliation of Restructuring Liability) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2021 USD ($)
Restructuring Reserve [Roll Forward]
Balance at January 1, 2021	$ 91
Lease restructuring charges related to operating lease liabilities	2
Cash payments / settlements during the period	(13)
Currency translation and other adjustments	(2)
Balance at June 30, 2021	78
Severance
Restructuring Reserve [Roll Forward]
Balance at January 1, 2021	15
Lease restructuring charges related to operating lease liabilities	0
Cash payments / settlements during the period	(7)
Currency translation and other adjustments	(2)
Balance at June 30, 2021	6
Lease Abandonment
Restructuring Reserve [Roll Forward]
Balance at January 1, 2021	52
Lease restructuring charges related to operating lease liabilities	2
Cash payments / settlements during the period	(3)
Currency translation and other adjustments	0
Balance at June 30, 2021	51
Other
Restructuring Reserve [Roll Forward]
Balance at January 1, 2021	24
Lease restructuring charges related to operating lease liabilities	0
Cash payments / settlements during the period	(3)
Currency translation and other adjustments	0
Balance at June 30, 2021	$ 21

X

- Definition

Restructuring Charges, Operating Lease Liabilities

+ References

No definition available.

+ Details

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Balance Type:	debit
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X

- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 17
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3367-108585

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X

- Definition

Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 5.P.4(b)(2))
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747

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X

- 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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X

- Definition

Amount of foreign currency translation gain (loss) which decreases (increases) the restructuring reserve.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4(b)(2))
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747

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