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Reorganization and Business Transformation - Costs Incurred For Reorganization Plan (Details) $ in Millions	6 Months Ended
	Jun. 30, 2021 USD ($)
2020 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring reserve. beginning balance	$ 18
Expense accruals	9
Cash payments	(25)
Restructuring reserve. ending balance	2
Voluntary Separation Program
Restructuring Cost and Reserve [Line Items]
Restructuring reserve. beginning balance	16
Expense accruals	3
Cash payments	(17)
Restructuring reserve. ending balance	2
Workforce Reduction and Real Estate Rationalization Measures | Employee severance and other employee-related costs
Restructuring Cost and Reserve [Line Items]
Restructuring reserve. beginning balance	2
Expense accruals	4
Cash payments	(6)
Restructuring reserve. ending balance	0
Workforce Reduction and Real Estate Rationalization Measures | Facilities lease related costs, outside service, legal and other associated costs
Restructuring Cost and Reserve [Line Items]
Restructuring reserve. beginning balance	0
Expense accruals	2
Cash payments	(2)
Restructuring reserve. ending balance	$ 0

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- Definition

Payments For Restructuring, Net Of Advance Payments

+ References

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 45
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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.

+ References

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-Topic 420
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-Paragraph 1
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