Stockholders' Equity - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
AOCI beginning balance	$ (9,916)
Other comprehensive income (loss), net of tax	1,376	$ (4,467)
AOCI ending balance	(8,540)
Securities available for sale | Available-for-sale securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
AOCI beginning balance	(7,676)	297
Other comprehensive income (loss) before reclassifications	962	(3,253)
Amounts reclassified from AOCI into earnings	0	0
Other comprehensive income (loss), net of tax	962	(3,253)
AOCI ending balance	(6,714)	(2,956)
Hedging Relationships
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
AOCI beginning balance	(2,182)	118
Other comprehensive income (loss) before reclassifications	198	(1,123)
Amounts reclassified from AOCI into earnings	203	(86)
Other comprehensive income (loss), net of tax	401	(1,209)
AOCI ending balance	(1,781)	(1,091)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
AOCI beginning balance	(20)	(21)
Other comprehensive income (loss) before reclassifications	13	(5)
Amounts reclassified from AOCI into earnings	0	0
Other comprehensive income (loss), net of tax	13	(5)
AOCI ending balance	(7)	(26)
Other
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
AOCI beginning balance	(38)	(20)
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from AOCI into earnings	0	0
Other comprehensive income (loss), net of tax	0	0
AOCI ending balance	(38)	(20)
Total
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
AOCI beginning balance	(9,916)	374
Other comprehensive income (loss) before reclassifications	1,173	(4,381)
Amounts reclassified from AOCI into earnings	203	(86)
Other comprehensive income (loss), net of tax	1,376	(4,467)
AOCI ending balance	(8,540)	(4,093)
Net investment hedges
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Other comprehensive gain (loss)	$ (38)	$ 48