Accumulated Other Comprehensive (Loss) Income (Changes Net of Tax in the Balances of Each Components of Other Accumulated Comprehensive Income Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of year	$ 12,370	$ 10,749
Other comprehensive (loss) income before reclassifications	(964)	5
Amounts reclassified from accumulated other comprehensive income	19	14
Other comprehensive (loss) income, net of tax	(945)	19	$ (739)
Balance, end of year	13,535	12,370	10,749
Total
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of year	(5,295)	(5,314)	(4,575)
Other comprehensive (loss) income, net of tax	(945)	19	(739)
Balance, end of year	(6,240)	(5,295)	(5,314)
Pension/Post-Retirement Plans Gains (Losses)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of year	(3,101)	(2,721)
Other comprehensive (loss) income before reclassifications	(326)	(394)
Amounts reclassified from accumulated other comprehensive income	19	14
Other comprehensive (loss) income, net of tax	(307)	(380)	481
Balance, end of year	(3,408)	(3,101)	(2,721)
Foreign currency translation adjustments
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of year	(2,194)	(2,593)
Other comprehensive (loss) income before reclassifications	(638)	399	(1,220)
Amounts reclassified from accumulated other comprehensive income	0	0
Other comprehensive (loss) income, net of tax	(638)	399
Balance, end of year	$ (2,832)	$ (2,194)	$ (2,593)