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Restructuring Programs (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Restructuring Cost and Reserve [Line Items]
Strategic transformation costs	$ 1	$ 2	$ 2	$ 4
Restructuring Reserve [Roll Forward]
Balance at beginning of period			6	21
Provision			22	31
Changes in estimates			(3)	1
Total Net Current Period Charges	7	27	19	32
Charges against reserve and currency			(21)	(37)
Balance at end of period	4	16	4	16
Unallocated costs
Restructuring Reserve [Roll Forward]
Total Net Current Period Charges	5	18	17	21
Commercial Industries: | Operating Segments
Restructuring Reserve [Roll Forward]
Total Net Current Period Charges	2	5	2	7
Government Services: | Operating Segments
Restructuring Reserve [Roll Forward]
Total Net Current Period Charges	0	1	0	1
Transportation: | Operating Segments
Restructuring Reserve [Roll Forward]
Total Net Current Period Charges	0	3	0	3
Severance and Related Costs
Restructuring Reserve [Roll Forward]
Balance at beginning of period			3	15
Provision			2	10
Changes in estimates			0	0
Total Net Current Period Charges			2	10
Charges against reserve and currency			(2)	(13)
Balance at end of period	3	12	3	12
Termination and Other Costs
Restructuring Reserve [Roll Forward]
Balance at beginning of period			3	6
Provision			16	10
Changes in estimates			(3)	1
Total Net Current Period Charges			13	11
Charges against reserve and currency			(15)	(13)
Balance at end of period	1	4	1	4
Asset Impairments
Restructuring Reserve [Roll Forward]
Balance at beginning of period			0	0
Provision			4	11
Changes in estimates			0	0
Total Net Current Period Charges			4	11
Charges against reserve and currency			(4)	(11)
Balance at end of period	0	0	0	0
Data Center Consolidation [Member] | Termination and Other Costs
Restructuring Reserve [Roll Forward]
Provision	$ 8	$ 6	$ 15	$ 8

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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

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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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.

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Amount of expense (reversal of expense) which increases (decreases) the restructuring reserve from an adjustment to a previously accrued restructuring liability.

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