Equity Activity - AOCI Rollforward (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Accumulated Other Comprehensive Income (Loss) (net of tax)
Balance at the Beginning of the Period	$ 19,112	$ 21,513	$ 18,996	$ 20,727
Other comprehensive income/(loss)	363	605	1,066	1,685
Balance at the End of the Period	19,476	22,067	19,476	22,067
Accumulated Other Comprehensive Income/(Loss)
Accumulated Other Comprehensive Income (Loss) (net of tax)
Balance at the Beginning of the Period	(22,532)	(28,257)	(23,234)	(29,337)
Other comprehensive income before reclassifications			366	532
Amount reclassified from accumulated other comprehensive income			699	1,153
Other comprehensive income/(loss)	363	605	1,066	1,685
Balance at the End of the Period	(22,169)	(27,652)	(22,169)	(27,652)
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	147	(26)	191	114
Amount reclassified from accumulated other comprehensive income			14	187
Other comprehensive income/(loss)	161	42	205	301
Balance at the End of the Period	187	(155)	187	(155)
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			172	393
Other comprehensive income/(loss)	(134)	72	172	393
Balance at the End of the Period	(3,189)	(4,271)	(3,189)	(4,271)
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			3	25
Amount reclassified from accumulated other comprehensive income			686	966
Other comprehensive income/(loss)	336	491	689	991
Balance at the End of the Period	(19,165)	(23,225)	(19,165)	(23,225)
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	0	0
Other comprehensive income/(loss)	0	0	0	0
Balance at the End of the Period	$ (1)	$ (1)	$ (1)	$ (1)