Other Comprehensive (Loss) Income (Schedule of Changes, Net of Tax, in Each Component of AOCI) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance, beginning of period			$ 13,535
Other comprehensive (loss) income, net of tax	$ (197)	$ 537	799	$ 305
Balance, end of period	15,359	13,882	15,359	13,882
Deferred tax assets, net	1,600	1,500	1,600	1,500
Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance, beginning of period	(5,244)	(5,527)	(6,240)	(5,295)
Other comprehensive income (loss) before reclassifications	(205)	533	775	292
Amounts reclassified from accumulated other comprehensive income	8	4	24	13
Other comprehensive (loss) income, net of tax	(197)	537	799	305
Balance, end of period	(5,441)	(4,990)	(5,441)	(4,990)
Pension/Post-Retirement Plans Gains (Losses)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance, beginning of period	(3,632)	(3,050)	(3,408)	(3,101)
Other comprehensive income (loss) before reclassifications	58	(135)	(182)	(93)
Amounts reclassified from accumulated other comprehensive income	8	4	24	13
Other comprehensive (loss) income, net of tax	66	(131)	(158)	(80)
Balance, end of period	(3,566)	(3,181)	(3,566)	(3,181)
Foreign Currency Translation Adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance, beginning of period	(1,612)	(2,477)	(2,832)	(2,194)
Other comprehensive income (loss) before reclassifications	(263)	668	957	385
Amounts reclassified from accumulated other comprehensive income	0	0	0	0
Other comprehensive (loss) income, net of tax	(263)	668	957	385
Balance, end of period	$ (1,875)	$ (1,809)	$ (1,875)	$ (1,809)