Income Taxes, Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current:
Country	$ 2,219	$ 2,913	$ 283
U.S. state / Canadian provincial	297	465	98
Total current	2,516	3,378	381
Deferred:
Country	94	26	(58)
U.S. state / Canadian provincial	9	24	(68)
Total deferred	103	50	(126)
Income tax expense	2,619	3,428	255
U.S. [Member]
Current:
Country	1,804	2,147	68
U.S. state / Canadian provincial	157	153	1
Total current	1,961	2,300	69
Deferred:
Country	25	164	5
U.S. state / Canadian provincial	(12)	80	(24)
Total deferred	13	244	(19)
Income tax expense	1,974	2,544	50
Foreign [Member]
Current:
Country	415	766	215
U.S. state / Canadian provincial	140	312	97
Total current	555	1,078	312
Deferred:
Country	69	(138)	(63)
U.S. state / Canadian provincial	21	(56)	(44)
Total deferred	90	(194)	(107)
Income tax expense	$ 645	$ 884	$ 205