Income Taxes, Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Current:
Country	$ 644	$ 2,219	$ 2,913
U.S. state / Canadian provincial	135	297	465
Total current	779	2,516	3,378
Deferred:
Country	(76)	94	26
U.S. state / Canadian provincial	(11)	9	24
Total deferred	(87)	103	50
Income tax expense	692	2,619	3,428
U.S. [Member]
Current:
Country	464	1,804	2,147
U.S. state / Canadian provincial	37	157	153
Total current	501	1,961	2,300
Deferred:
Country	(99)	25	164
U.S. state / Canadian provincial	(13)	(12)	80
Total deferred	(112)	13	244
Income tax expense	389	1,974	2,544
Foreign [Member]
Current:
Country	180	415	766
U.S. state / Canadian provincial	98	140	312
Total current	278	555	1,078
Deferred:
Country	23	69	(138)
U.S. state / Canadian provincial	2	21	(56)
Total deferred	25	90	(194)
Income tax expense	$ 303	$ 645	$ 884