Changes in Accumulated Other Comprehensive Losses (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ 154,562	$ 133,911	$ 139,940	$ 132,726
Components of Other Comprehensive Income (Loss):
Other Comprehensive Gain (Loss), Net of Tax	318	(123)	716	1,194
Ending balance	159,627	136,722	159,627	136,722
Related income taxes	3,571	1,940	10,636	4,047
Total
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(3,491)	(4,295)	(3,889)	(5,612)
Components of Other Comprehensive Income (Loss):
Before Reclassifications			353	526
Reclassifications			363	668
Other Comprehensive Gain (Loss), Net of Tax	318	(123)	716	1,194
Ending balance	(3,173)	(4,418)	(3,173)	(4,418)
Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			(162)	(107)
Components of Other Comprehensive Income (Loss):
Before Reclassifications			(97)	(31)
Reclassifications			0	0
Other Comprehensive Gain (Loss), Net of Tax			(97)	(31)
Ending balance	(259)	(138)	(259)	(138)
Unrealized Holding Gains (Losses) on Securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			(11)	(10)
Components of Other Comprehensive Income (Loss):
Before Reclassifications			(3)	(1)
Reclassifications			0	0
Other Comprehensive Gain (Loss), Net of Tax			(3)	(1)
Ending balance	(14)	(11)	(14)	(11)
Derivatives
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			0	0
Components of Other Comprehensive Income (Loss):
Before Reclassifications			69	(5)
Reclassifications			(31)	2
Other Comprehensive Gain (Loss), Net of Tax			38	(3)
Ending balance	38	(3)	38	(3)
Defined Benefit Plans
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			(3,716)	(5,495)
Components of Other Comprehensive Income (Loss):
Before Reclassifications			384	563
Reclassifications			394	666
Other Comprehensive Gain (Loss), Net of Tax			778	1,229
Ending balance	$ (2,938)	$ (4,266)	(2,938)	$ (4,266)
Defined Benefit Plans | Reclassification out of Accumulated Other Comprehensive Income
Components of Other Comprehensive Income (Loss):
Employee Benefits for reclassified components			519
Related income taxes			$ 125