Stockholders' Equity - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
AOCI beginning balance			$ (9,916)
Other comprehensive income (loss), net of tax	$ (1,278)	$ (2,823)	98	$ (7,290)
AOCI ending balance	(9,818)		(9,818)
Securities available for sale | Available-for-sale securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
AOCI beginning balance	(6,714)	(2,956)	(7,676)	297
Other comprehensive income (loss) before reclassifications	(888)	(2,293)	74	(5,546)
Amounts reclassified from AOCI into earnings	0	5	0	5
Other comprehensive income (loss), net of tax	(888)	(2,288)	74	(5,541)
AOCI ending balance	(7,602)	(5,244)	(7,602)	(5,244)
Hedging Relationships
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
AOCI beginning balance	(1,781)	(1,091)	(2,182)	118
Other comprehensive income (loss) before reclassifications	(664)	(412)	(466)	(1,535)
Amounts reclassified from AOCI into earnings	240	(71)	443	(157)
Other comprehensive income (loss), net of tax	(424)	(483)	(23)	(1,692)
AOCI ending balance	(2,205)	(1,574)	(2,205)	(1,574)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
AOCI beginning balance	(7)	(26)	(20)	(21)
Other comprehensive income (loss) before reclassifications	34	(52)	47	(57)
Amounts reclassified from AOCI into earnings	0	0	0	0
Other comprehensive income (loss), net of tax	34	(52)	47	(57)
AOCI ending balance	27	(78)	27	(78)
Other
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
AOCI beginning balance	(38)	(20)	(38)	(20)
Other comprehensive income (loss) before reclassifications	0	0	0	0
Amounts reclassified from AOCI into earnings	0	0	0	0
Other comprehensive income (loss), net of tax	0	0	0	0
AOCI ending balance	(38)	(20)	(38)	(20)
Total
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
AOCI beginning balance	(8,540)	(4,093)	(9,916)	374
Other comprehensive income (loss) before reclassifications	(1,518)	(2,757)	(345)	(7,138)
Amounts reclassified from AOCI into earnings	240	(66)	443	(152)
Other comprehensive income (loss), net of tax	(1,278)	(2,823)	98	(7,290)
AOCI ending balance	(9,818)	(6,916)	(9,818)	(6,916)
Net investment hedges
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Other comprehensive gain (loss)	$ (78)	$ 174	$ (116)	$ 222