Restructuring and Transaction Costs (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Restructuring Cost And Reserve [Line Items]
Restructuring and transaction costs	$ 0	$ 23	$ 0	$ 212
Reduction of workforce [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring and transaction costs				40
Reduction Of Workforce [Member]
Restructuring Cost And Reserve [Line Items]
Noncash-Accelerated vesting				21
Transaction Costs [Member]
Restructuring Cost And Reserve [Line Items]
Transaction costs		$ 46		46
Merger Integration [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring and transaction costs				$ 166