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Reorganization and Business Transformation - Costs Incurred For Reorganization Plan (Details) $ in Millions	9 Months Ended
	Sep. 30, 2021 USD ($)
2020 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Balance at December 31, 2020	$ 18
Expense accruals	10
Cash payments	(26)
Balance at September 30, 2021	2
Voluntary Separation Program
Restructuring Cost and Reserve [Line Items]
Balance at December 31, 2020	16
Expense accruals	3
Cash payments	(18)
Balance at September 30, 2021	1
Workforce Reduction and Real Estate Rationalization Measures | Employee severance and other employee-related costs
Restructuring Cost and Reserve [Line Items]
Balance at December 31, 2020	2
Expense accruals	4
Cash payments	(5)
Balance at September 30, 2021	1
Workforce Reduction and Real Estate Rationalization Measures | Facilities lease related costs, outside service, legal and other associated costs
Restructuring Cost and Reserve [Line Items]
Balance at December 31, 2020	0
Expense accruals	3
Cash payments	(3)
Balance at September 30, 2021	$ 0

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Payments For Restructuring, Net Of Advance Payments

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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

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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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