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Restructuring Charges (Restructuring Reserve Rollforward) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Restructuring Reserve [Roll Forward]
Additions	$ 1	$ 2	$ 7	$ 12
Workforce Reduction
Restructuring Reserve [Roll Forward]
Liability at December 31, 2020			3
Additions			7
Distributions			(10)
Liability at June 30, 2021	$ 0		$ 0