Shareholders' Equity - Accumulated Other Comprehensive Income by Component (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 25,326	$ 23,799	$ 25,191
Other comprehensive income (loss) before reclassifications	847	(160)	775
Increase (decrease) due to amounts reclassified from accumulated other comprehensive income	210	414	582
Other comprehensive income (loss)	1,057	254	1,357
Ending balance	27,841	25,326	23,799
Unrecognized gain (loss) in AOCI	(267)	(374)	(530)
Net Unrealized Gains (Losses) on Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(132)	(131)	(359)
Other comprehensive income (loss) before reclassifications	(5)	39	75
Increase (decrease) due to amounts reclassified from accumulated other comprehensive income	104	(40)	153
Other comprehensive income (loss)	99	(1)	228
Ending balance	(33)	(132)	(131)
Net Unrealized Gains (Losses) on Investment Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(480)	(947)	(1,817)
Other comprehensive income (loss) before reclassifications	224	15	442
Increase (decrease) due to amounts reclassified from accumulated other comprehensive income	105	452	428
Other comprehensive income (loss)	329	467	870
Ending balance	(151)	(480)	(947)
Net Unrealized Losses on Retirement Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(129)	(145)	(143)
Other comprehensive income (loss) before reclassifications	36	14	(3)
Increase (decrease) due to amounts reclassified from accumulated other comprehensive income	1	2	1
Other comprehensive income (loss)	37	16	(2)
Ending balance	(92)	(129)	(145)
Foreign Currency Translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(2,168)	(1,400)	(1,751)
Other comprehensive income (loss) before reclassifications	1,375	(768)	351
Increase (decrease) due to amounts reclassified from accumulated other comprehensive income	0	0	0
Other comprehensive income (loss)	1,375	(768)	351
Ending balance	(793)	(2,168)	(1,400)
Net Unrealized Gains (Losses) on Hedges of Net Investments in Non-U.S. Subsidiaries
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	809	269	359
Other comprehensive income (loss) before reclassifications	(783)	540	(90)
Increase (decrease) due to amounts reclassified from accumulated other comprehensive income	0	0	0
Other comprehensive income (loss)	(783)	540	(90)
Ending balance	26	809	269
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(2,100)	(2,354)	(3,711)
Other comprehensive income (loss)	1,057	254	1,357
Ending balance	$ (1,043)	$ (2,100)	$ (2,354)