CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 478	$ 364	$ 989	$ 784
Other comprehensive income (loss):
Net unrealized derivative instruments gains (losses) arising during the periods, net of income taxes of ($175), ($66), ($115) and ($236), respectively	(505)	(178)	(332)	(669)
Reclassification adjustment for net derivative (gains) losses included in net income, net of income taxes of $35, ($3), $68 and ($11), respectively	101	(8)	195	(32)
Net unrealized debt securities gains (losses) arising during the periods, net of income taxes of ($80), ($271), $29 and ($628), respectively	(239)	(779)	88	(1,856)
Reclassification of net debt securities (gains) losses to net income, net of income taxes of $7, $0, $14 and ($1), respectively	20	(1)	40	(4)
Reclassification of actuarial (gain) loss to net income, net of income taxes of $1, ($2), $2 and ($1), respectively	3	6	6	8
Total other comprehensive income (loss), net of income taxes	(620)	(960)	(3)	(2,553)
Total comprehensive income (loss)	$ (142)	$ (596)	$ 986	$ (1,769)