Basis of Presentation - Pension Plan (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2024	Sep. 30, 2024	Sep. 30, 2023
Retirement-Related Benefits
Pension settlement charge		$ 2,700	$ 2,725	$ 0
Pension settlement charge, net of tax		2,000
Pension settlement charge, tax		$ 700
Personal Pension Plan (PPP)
Retirement-Related Benefits
Benefit plan obligations transferred from plan	$ 6,000
Benefit plan assets transferred from plan	$ 6,000