Equity Activity - AOCI Rollforward (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at the beginning of the period	$ 27,588	$ 24,103	$ 27,393	$ 22,613
Balance at the end of the period	27,990	24,530	27,990	24,530
Pension settlement charge		2,700	0	2,725
Pension settlement charge, net of tax		2,000
Accumulated Other Comprehensive Income/(Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at the beginning of the period	(16,041)	(18,319)	(15,269)	(18,761)
Other comprehensive income before reclassifications			(572)	(100)
Amount reclassified from accumulated other comprehensive income			(142)	2,443
Other comprehensive income/(loss)	58	1,900	(715)	2,343
Balance at the end of the period	(15,983)	(16,418)	(15,983)	(16,418)
Foreign currency translation adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at the beginning of the period			(3,512)	(3,488)
Other comprehensive income before reclassifications			(494)	(224)
Other comprehensive income/(loss)	(140)	(60)	(494)	(224)
Balance at the end of the period	(4,005)	(3,713)	(4,005)	(3,713)
Net Unrealized Gains/(Losses) on Available- For-Sale Securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at the beginning of the period			0	(1)
Other comprehensive income before reclassifications	(1)	0	0	1
Other comprehensive income/(loss)	(1)	0	0	1
Balance at the end of the period	1	(1)	1	(1)
Net Unrealized Gains/(Losses) on Cash Flow Hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at the beginning of the period			237	(106)
Other comprehensive income before reclassifications	14	(158)	(87)	46
Amount reclassified from accumulated other comprehensive income			(485)	(151)
Other comprehensive income/(loss)	84	(333)	(572)	(105)
Balance at the end of the period	(335)	(211)	(335)	(211)
Net Change Retirement- Related Benefit Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at the beginning of the period			(11,994)	(15,165)
Other comprehensive income before reclassifications			8	78
Amount reclassified from accumulated other comprehensive income			343	2,594
Other comprehensive income/(loss)	115	2,293	351	2,672
Balance at the end of the period	$ (11,643)	$ (12,493)	$ (11,643)	$ (12,493)