Other Comprehensive (Loss) Income (Schedule of Components of Accumulated Other Comprehensive (Loss) Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period			$ 10,749
Other comprehensive loss, net of tax	$ (405)	$ (685)	(146)	$ (1,473)
Balance, end of period	11,586	9,791	11,586	9,791
Deferred tax assets, net	1,344		1,344		$ 1,352
Deferred tax liabilities, net	13		13		$ 21
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(5,055)	(5,363)	(5,314)	(4,575)
Other comprehensive (loss) income before reclassifications	(409)	(713)	(156)	(1,557)
Amounts reclassified from accumulated other comprehensive loss	4	28	10	84
Other comprehensive loss, net of tax	(405)	(685)	(146)	(1,473)
Balance, end of period	(5,460)	(6,048)	(5,460)	(6,048)
Pension/Post-Retirement Plans Gains (Losses)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(2,811)	(2,957)	(2,721)	(3,202)
Other comprehensive (loss) income before reclassifications	76	182	(20)	371
Amounts reclassified from accumulated other comprehensive loss	4	28	10	84
Other comprehensive loss, net of tax	80	210	(10)	455
Balance, end of period	(2,731)	(2,747)	(2,731)	(2,747)
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(2,244)	(2,406)	(2,593)	(1,373)
Other comprehensive (loss) income before reclassifications	(485)	(895)	(136)	(1,928)
Amounts reclassified from accumulated other comprehensive loss	0	0	0	0
Other comprehensive loss, net of tax	(485)	(895)	(136)	(1,928)
Balance, end of period	$ (2,729)	$ (3,301)	$ (2,729)	$ (3,301)