Stockholders' Equity - Reclassifications from AOCI (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest income (loss)	$ 27,114	$ 24,171	$ 22,913
Interest expense	4,123	1,598	3,120
Non-interest income (loss)	905	826	1,350
Income (loss) from continuing operations before income taxes	9,240	15,809	3,203
Income tax provision (benefit)	1,880	3,415	486
Net income	7,360	12,390	2,714
Accumulated other comprehensive income (loss)	(9,916)	374
Other comprehensive income (loss), net of tax	(10,290)	(3,120)	2,346
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income	(110)	854	414
Securities available for sale | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Non-interest income (loss)	(9)	2	25
Income tax provision (benefit)	(2)	0	6
Net income	(7)	2	19
Hedging Relationships
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive income (loss)	(2,182)	118	1,362	$ 354
Other comprehensive income (loss) before reclassifications	(2,404)	(396)	1,401
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	104	(848)	(393)
Other comprehensive income (loss), net of tax	(2,300)	(1,244)	1,008
Hedging Relationships | Interest rate contracts | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest income (loss)	(121)	957	566
Hedging Relationships | Foreign exchange contracts | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest income (loss)	3	1	10
Interest expense	(3)	(3)	(3)
Non-interest income (loss)	(17)	163	(57)
Income (loss) from continuing operations before income taxes	(138)	1,118	516
Income tax provision (benefit)	(34)	270	123
Net income	(104)	848	393
Foreign Currency Translation Adjustments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive income (loss)	(20)	(21)	(31)	(107)
Other comprehensive income (loss) before reclassifications	1	10	76
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	0	0
Other comprehensive income (loss), net of tax	1	10	76
Other
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive income (loss)	(38)	(20)	(23)	(26)
Other comprehensive income (loss) before reclassifications	(17)	7	5
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(1)	(4)	(2)
Other comprehensive income (loss), net of tax	(18)	3	3
Other | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income (loss) from continuing operations before income taxes	1	5	2
Income tax provision (benefit)	0	1	0
Net income	1	4	2
Accumulated Other Comprehensive Income (Loss)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive income (loss)	(9,916)	374	3,494	$ 1,156
Other comprehensive income (loss) before reclassifications	(10,400)	(2,266)	2,760
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	110	(854)	(414)
Other comprehensive income (loss), net of tax	$ (10,290)	$ (3,120)	$ 2,346