Employee Benefits - Costs (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Pension Benefits
Net Periodic Benefit Cost
Net Periodic Other Benefit Costs	$ 123	$ 190
Pension Benefits | United States
Net Periodic Benefit Cost
Service cost	86	118
Interest cost	112	66
Expected return on plan assets	(140)	(161)
Amortization of prior service costs (credits)	1	0
Amortization of actuarial losses (gains)	51	65
Settlement losses	0	86
Net Periodic Other Benefit Costs	110	174
Pension Benefits | International
Net Periodic Benefit Cost
Service cost	15	22
Interest cost	47	36
Expected return on plan assets	(51)	(48)
Amortization of prior service costs (credits)	2	2
Amortization of actuarial losses (gains)	2	4
Settlement losses	0	0
Acquisitions / (divestitures)	(2)	0
Net Periodic Other Benefit Costs	13	16
Other Benefits
Net Periodic Benefit Cost
Service cost	8	11
Interest cost	24	15
Amortization of prior service costs (credits)	(6)	(6)
Amortization of actuarial losses (gains)	(5)	3
Net Periodic Other Benefit Costs	$ 21	$ 23