Other Comprehensive Income (Loss) (Schedule of Components of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period			$ 11,222
Other comprehensive (loss) income, net of tax	$ (684)	$ 44	(788)	$ (43)
Balance, end of period	10,917	10,264	10,917	10,264
AOCI Attributable to Parent
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(4,679)	(5,197)	(4,575)	(5,110)
Other comprehensive income (loss), before reclassification, net of tax	(710)	8	(844)	(119)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	26	36	56	76
Other comprehensive (loss) income, net of tax	(684)	44	(788)	(43)
Balance, end of period	(5,363)	(5,153)	(5,363)	(5,153)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(3,137)	(4,122)	(3,202)	(4,126)
Other comprehensive income (loss), before reclassification, net of tax	154	(16)	189	(52)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	26	36	56	76
Other comprehensive (loss) income, net of tax	180	20	245	24
Balance, end of period	(2,957)	(4,102)	(2,957)	(4,102)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(1,542)	(1,075)	(1,373)	(984)
Other comprehensive income (loss), before reclassification, net of tax	(864)	24	(1,033)	(67)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	0	0	0
Other comprehensive (loss) income, net of tax	(864)	24	(1,033)	(67)
Balance, end of period	$ (2,406)	$ (1,051)	$ (2,406)	$ (1,051)