Restructuring Costs (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	$ 650		$ 650
Restructuring and related cost, cost incurred to date	540		540
Costs incurred	54	$ 52	140	$ 170	$ 301
Severance and Lease Exit Charges
Restructuring Cost and Reserve [Line Items]
Costs incurred	$ 36		$ 96