Equity Activity - AOCI Rollforward (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Accumulated Other Comprehensive Income (Loss) (net of tax)
Balance at the Beginning of the Period	$ 18,996	$ 20,727
Other comprehensive income/(loss)	703	1,080
Balance at the End of the Period	19,112	21,513
Accumulated Other Comprehensive Income/(Loss)
Accumulated Other Comprehensive Income (Loss) (net of tax)
Balance at the Beginning of the Period	(23,234)	(29,337)
Other comprehensive income before reclassifications	355	475
Amount reclassified from accumulated other comprehensive income	348	606
Other comprehensive income/(loss)	703	1,080
Balance at the End of the Period	(22,532)	(28,257)
Net Unrealized Gains/(Losses) on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) (net of tax)
Balance at the Beginning of the Period	(18)	(456)
Other comprehensive income before reclassifications	44	140
Amount reclassified from accumulated other comprehensive income	0	119
Other comprehensive income/(loss)	44	259
Balance at the End of the Period	26	(197)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) (net of tax)
Balance at the Beginning of the Period	(3,362)	(4,665)
Other comprehensive income before reclassifications	306	321
Other comprehensive income/(loss)	306	321
Balance at the End of the Period	(3,056)	(4,343)
Net Change Retirement-Related Benefit Plans
Accumulated Other Comprehensive Income (Loss) (net of tax)
Balance at the Beginning of the Period	(19,854)	(24,216)
Other comprehensive income before reclassifications	5	14
Amount reclassified from accumulated other comprehensive income	348	486
Other comprehensive income/(loss)	352	500
Balance at the End of the Period	(19,502)	(23,716)
Net Unrealized Gains/(Losses) on Available-For-Sale Securities
Accumulated Other Comprehensive Income (Loss) (net of tax)
Balance at the Beginning of the Period	(1)	0
Other comprehensive income before reclassifications	0	0
Other comprehensive income/(loss)	0	0
Balance at the End of the Period	$ (1)	$ (1)