Other Comprehensive (Loss) Income (Schedule of Accumulated Other Comprehensive (Loss) Income) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period			$ 12,370
Other comprehensive (loss) income, net of tax	$ (18)	$ 179	(232)	$ 259
Balance, end of period	13,565	12,139	13,565	12,139
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(5,509)	(5,234)	(5,295)	(5,314)
Other comprehensive income (loss) before reclassifications	(23)	176	(241)	253
Amounts reclassified from accumulated other comprehensive income	5	3	9	6
Other comprehensive (loss) income, net of tax	(18)	179	(232)	259
Balance, end of period	(5,527)	(5,055)	(5,527)	(5,055)
Pension/Post-Retirement Plans Gains (Losses)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(3,064)	(2,766)	(3,101)	(2,721)
Other comprehensive income (loss) before reclassifications	9	(48)	42	(96)
Amounts reclassified from accumulated other comprehensive income	5	3	9	6
Other comprehensive (loss) income, net of tax	14	(45)	51	(90)
Balance, end of period	(3,050)	(2,811)	(3,050)	(2,811)
Deferred tax assets, net	1,500	1,400	1,500	1,400
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(2,445)	(2,468)	(2,194)	(2,593)
Other comprehensive income (loss) before reclassifications	(32)	224	(283)	349
Amounts reclassified from accumulated other comprehensive income	0	0	0	0
Other comprehensive (loss) income, net of tax	(32)	224	(283)	349
Balance, end of period	$ (2,477)	$ (2,244)	$ (2,477)	$ (2,244)