Restructuring Costs (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, cost incurred to date	$ 325		$ 325
Costs incurred	52	$ 38	170	$ 96
Severance and Lease Exit Charges
Restructuring Cost and Reserve [Line Items]
Costs incurred	37		109
Minimum
Restructuring Cost and Reserve [Line Items]
Estimated remaining costs	425		425
Maximum
Restructuring Cost and Reserve [Line Items]
Estimated remaining costs	$ 475		$ 475