Employee Benefits - Costs (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Pension Benefits
Net Periodic Benefit Cost
Net Periodic Other Benefit Costs	$ 138	$ 125	$ 275	$ 248
Pension Benefits | United States
Net Periodic Benefit Cost
Service cost	89	85	178	171
Interest cost	116	112	232	224
Expected return on plan assets	(149)	(139)	(298)	(279)
Amortization of prior service costs (credits)	1	1	2	2
Amortization of actuarial losses (gains)	61	50	122	101
Settlement losses	0	0	0	0
Net Periodic Other Benefit Costs	118	109	236	219
Pension Benefits | International
Net Periodic Benefit Cost
Service cost	13	14	27	29
Interest cost	48	49	95	96
Expected return on plan assets	(47)	(51)	(97)	(102)
Amortization of prior service costs (credits)	2	2	5	4
Amortization of actuarial losses (gains)	4	2	9	4
Settlement losses	0	0	0	0
Acquisitions / (divestitures)	0	0	0	(2)
Net Periodic Other Benefit Costs	20	16	39	29
Other Benefits
Net Periodic Benefit Cost
Service cost	9	8	17	16
Interest cost	25	25	50	49
Amortization of prior service costs (credits)	(6)	(7)	(12)	(13)
Amortization of actuarial losses (gains)	(3)	(4)	(7)	(9)
Net Periodic Other Benefit Costs	$ 25	$ 22	$ 48	$ 43