Stockholders' Equity - Reclassifications from AOCI (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest income (loss)	$ 7,113	$ 6,517	$ 14,299	$ 12,914
Interest expense	3,053	578	5,621	965
Non-interest income (loss)	275	99	474	442
Income (loss) from continuing operations before income taxes	1,728	2,564	2,891	5,509
Income tax provision (benefit)	297	533	500	1,075
Net income	1,431	2,031	2,391	4,434
Accumulated other comprehensive loss	(9,818)		(9,818)			$ (9,916)
Other comprehensive income (loss), net of tax	(1,278)	(2,823)	98	(7,290)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income	(240)	66	(443)	152
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)	0	(6)	0	(6)
Income tax provision (benefit)	0	(1)	0	(1)
Net income	0	(5)	0	(5)
Hedging Relationships
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive loss	(2,205)	(1,574)	(2,205)	(1,574)	$ (1,781)	(2,182)	$ (1,091)	$ 118
Other comprehensive income (loss) before reclassifications	(664)	(412)	(466)	(1,535)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	240	(71)	443	(157)
Other comprehensive income (loss), net of tax	(424)	(483)	(23)	(1,692)
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)	(297)	63	(559)	190
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)	6	(1)
Interest expense	0	0	(1)	(1)
Non-interest income (loss)	(22)	31	(30)	18
Income (loss) from continuing operations before income taxes	(316)	93	(584)	206
Income tax provision (benefit)	(76)	22	(141)	49
Net income	(240)	71	(443)	157
Foreign Currency Translation Adjustments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive loss	27	(78)	27	(78)	(7)	(20)	(26)	(21)
Other comprehensive income (loss) before reclassifications	34	(52)	47	(57)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	0	0	0
Other comprehensive income (loss), net of tax	34	(52)	47	(57)
Other
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive loss	(38)	(20)	(38)	(20)	(38)	(38)	(20)	(20)
Other comprehensive income (loss) before reclassifications	0	0	0	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	0	0	0
Other comprehensive income (loss), net of tax	0	0	0	0
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	0	0	0	0
Net income	0	0	0	0
Accumulated Other Comprehensive Income (Loss)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive loss	(9,818)	(6,916)	(9,818)	(6,916)	$ (8,540)	$ (9,916)	$ (4,093)	$ 374
Other comprehensive income (loss) before reclassifications	(1,518)	(2,757)	(345)	(7,138)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	240	(66)	443	(152)
Other comprehensive income (loss), net of tax	$ (1,278)	$ (2,823)	$ 98	$ (7,290)