CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 364	$ 648	$ 784	$ 1,259
Other comprehensive income (loss):
Net unrealized derivative instruments gains (losses) arising during the periods, net of income taxes of ($66), $16, ($236) and $9, respectively	(178)	46	(669)	25
Reclassification adjustment for net derivative (gains) losses included in net income, net of income taxes of ($3), ($10), ($11) and ($19), respectively	(8)	(27)	(32)	(52)
Net unrealized debt securities gains (losses) arising during the periods, net of income taxes of ($271), $3, ($628) and ($97), respectively	(779)	10	(1,856)	(297)
Reclassification of net debt securities (gains) losses to net income, net of income taxes of $0, $0, ($1) and ($1), respectively	(1)	(3)	(4)	(5)
Reclassification of actuarial loss to net income, net of income taxes of ($2), $1, ($1) and $1, respectively	6	4	8	8
Total other comprehensive income (loss), net of income taxes	(960)	30	(2,553)	(321)
Total comprehensive income (loss)	$ (596)	$ 678	$ (1,769)	$ 938