Exit and Implementation Costs (Movement in Exit and Implementation Costs) (Details) - Initiative [Member] - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2025	Dec. 31, 2024
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning of period	$ 57		$ 0
Charges	43		68
Cash paid	(63)	$ (74)	(11)
Restructuring reserve, end of period	37	37	57
Exit Costs [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning of period	35		0
Charges	3		35
Cash paid	(12)	(12)	0
Restructuring reserve, end of period	26	26	35
Implementation Costs [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning of period	22		0
Charges	40		33
Cash paid	(51)	(62)	(11)
Restructuring reserve, end of period	$ 11	$ 11	$ 22