Property, Plant and Equipment (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)
Property, Plant and Equipment [Line Items]
Charges related to reduction in physical workspace	$ 192
Impairment of assets and other charges
Property, Plant and Equipment [Line Items]
Charges related to reduction in physical workspace	133
Operation, maintenance and other
Property, Plant and Equipment [Line Items]
Charges related to reduction in physical workspace	42
Depreciation and amortization
Property, Plant and Equipment [Line Items]
Charges related to reduction in physical workspace	$ 17