Accumulated Other Comprehensive (Loss) Income (Components of Accumulated Other Comprehensive Income Loss) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Deferred tax asset (liability) on foreign currency translation adjustments	$ (23)	$ 2
Deferred tax asset on net charges related to pension/post-retirement plans	1,558	1,463
Components of AOCI	13,535	12,370	$ 10,749
Total
Accumulated Other Comprehensive Income (Loss) [Line Items]
Components of AOCI	(6,240)	(5,295)	(5,314)	$ (4,575)
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Components of AOCI	(2,832)	(2,194)	(2,593)
Pension/Post-Retirement Plans Gains (Losses)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Components of AOCI	$ (3,408)	$ (3,101)	$ (2,721)