Retirement-Related Benefits - U.S. Retirement Plan Changes (Details) - Pension Plan - U.S. Plans - USD ($) $ in Millions		3 Months Ended	6 Months Ended
	Jan. 01, 2024	Jun. 30, 2024	Jun. 30, 2024
Retirement-Related Benefits
Service period	1 year
Benefit contribution monthly percent	5.00%
Benefit contribution interest percent, through 2026	6.00%
Increase (decrease) in actuarial losses due to changes in assumptions		$ 100	$ 200
Minimum
Retirement-Related Benefits
Benefit contribution interest percent, 2027 through 2033	3.00%