Employee Postretirement Benefits (Summarized Financial Information about Postretirement plans, Excluding Defined Contribution Retirement Plans) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Pension Plans
Benefit obligation at beginning of year		$ 2,441	$ 3,811
Service cost		13	16	$ 21
Interest cost		121	89	80
Actuarial (gain) loss(a)	[1]	59	(1,000)
Currency and other		51	(197)
Benefit payments from plans		(141)	(173)
Direct benefit payments		(9)	(8)
Settlements and curtailments		(66)	(97)
Benefit obligation at end of year		2,469	2,441	3,811
Fair value of plan assets at beginning of year		2,321	3,744
Actual return on plan assets		137	(987)
Employer contributions		26	30
Currency and other		52	(199)
Benefit payments		(141)	(173)
Settlements		(66)	(94)
Fair value of plan assets at end of year		2,329	2,321	3,744
Funded Status		(140)	(120)
Other Postretirement Benefit Plans
Benefit obligation at beginning of year		533	669
Service cost		4	7	8
Interest cost		30	21	19
Actuarial (gain) loss(a)	[1]	13	(113)
Currency and other		5	2
Benefit payments from plans		0	0
Direct benefit payments		(54)	(53)
Settlements and curtailments		0	0
Benefit obligation at end of year		531	533	669
Fair value of plan assets at beginning of year		0	0
Actual return on plan assets		0	0
Employer contributions		0	0
Currency and other		0	0
Benefit payments		0	0
Settlements		0	0
Fair value of plan assets at end of year		0	0	$ 0
Funded Status		$ (531)	$ (533)

[1] The actuarial net losses in 2023 and actuarial net gains in 2022 were primarily due to discount rate decreases and increases, respectively.