Accumulated Other Comprehensive Income (Loss) (Components of Accumulated Other Comprehensive Income Loss) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Components of AOCI	$ 10,749	$ 11,222	$ 9,260
Deferred tax asset on foreign currency translation adjustments	(8)	13
Deferred tax asset on net charges related to pension/post-retirement plans	1,340	1,501
Total
Accumulated Other Comprehensive Income (Loss) [Line Items]
Components of AOCI	(5,314)	(4,575)	(5,110)	$ (5,055)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Components of AOCI	(2,593)	(1,373)	(984)
Pension and Post-Retirement Plans Losses
Accumulated Other Comprehensive Income (Loss) [Line Items]
Components of AOCI	$ (2,721)	$ (3,202)	$ (4,126)