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Restructuring and Transaction Costs (Narrative) (Details) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)
Restructuring Cost And Reserve [Line Items]
Restructuring and transaction costs	$ 23	$ 212
Reduction of workforce [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring and transaction costs		166
Expense associated with accelerated awards		21
Reduction Of Workforce [Member] | Defined Benefit Settlements [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring and transaction costs		40
Transaction Costs [Member]
Restructuring Cost And Reserve [Line Items]
Underwriting, bank, legal and accounting fees	$ 46	$ 46

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