Changes in Accumulated Other Comprehensive Losses (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ 161,656	$ 160,434	$ 161,929	$ 160,242
Components of Other Comprehensive Income (Loss):
Other Comprehensive Gain (Loss), Net of Tax	41	30	36	87
Ending balance	160,263	159,298	160,263	159,298
Related income taxes	2,593	1,829	4,964	4,743
Total
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(2,965)	(2,741)	(2,960)	(2,798)
Components of Other Comprehensive Income (Loss):
Before Reclassifications			(75)	6
Reclassifications			111	81
Other Comprehensive Gain (Loss), Net of Tax	41	30	36	87
Ending balance	(2,924)	(2,711)	(2,924)	(2,711)
Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			(192)	(203)
Components of Other Comprehensive Income (Loss):
Before Reclassifications			(32)	0
Reclassifications			0	0
Other Comprehensive Gain (Loss), Net of Tax			(32)	0
Ending balance	(224)	(203)	(224)	(203)
Unrealized Holding Gains (Losses) on Securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			(11)	(12)
Components of Other Comprehensive Income (Loss):
Before Reclassifications			(9)	(3)
Reclassifications			0	0
Other Comprehensive Gain (Loss), Net of Tax			(9)	(3)
Ending balance	(20)	(15)	(20)	(15)
Derivatives
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			5	(12)
Components of Other Comprehensive Income (Loss):
Before Reclassifications			(46)	(5)
Reclassifications			27	13
Other Comprehensive Gain (Loss), Net of Tax			(19)	8
Ending balance	(14)	(4)	(14)	(4)
Defined Benefit Plans
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			(2,762)	(2,571)
Components of Other Comprehensive Income (Loss):
Before Reclassifications			12	14
Reclassifications			84	68
Other Comprehensive Gain (Loss), Net of Tax			96	82
Ending balance	$ (2,666)	$ (2,489)	(2,666)	$ (2,489)
Defined Benefit Plans | Reclassification out of Accumulated Other Comprehensive Income
Components of Other Comprehensive Income (Loss):
Employee Benefits for reclassified components			118
Related income taxes			$ 34