Other Comprehensive (Loss) Income (Schedule of Accumulated Other Comprehensive (Loss) Income) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	$ 12,370
Other comprehensive (loss) income, net of tax	(214)	$ 80
Balance, end of period	12,622	11,196
Deferred tax assets, net	1,500	1,400
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(5,295)	(5,314)
Other comprehensive income (loss) before reclassifications	(218)	77
Amounts reclassified from accumulated other comprehensive income	4	3
Other comprehensive (loss) income, net of tax	(214)	80
Balance, end of period	(5,509)	(5,234)
Pension/Post-Retirement Plans Gains (Losses)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(3,101)	(2,721)
Other comprehensive income (loss) before reclassifications	33	(48)
Amounts reclassified from accumulated other comprehensive income	4	3
Other comprehensive (loss) income, net of tax	37	(45)
Balance, end of period	(3,064)	(2,766)
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(2,194)	(2,593)
Other comprehensive income (loss) before reclassifications	(251)	125
Amounts reclassified from accumulated other comprehensive income	0	0
Other comprehensive (loss) income, net of tax	(251)	125
Balance, end of period	$ (2,445)	$ (2,468)