Consolidated Statements Of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statements of Comprehensive Income (Loss)
Net income (loss)	$ (36)	$ (61)	$ (109)	$ (167)
Available-for-sale securities with no credit losses:
Unrealized gains (losses) arising during the period	(126)	55	(297)	(32)
Reclassification adjustments for (gains) losses included in net income (loss)	(2)	(3)	(2)	(8)
Available-for-sale securities with credit losses:
Unrealized gains (losses) arising during the period	(1)	0	(1)	0
Foreign currency translation:
Foreign currency translation gains (losses)	1	2	1	3
Instrument-specific credit risk of liabilities measured at fair value:
Unrealized gains (losses) arising during the period	(6)	6	(20)	1
Reclassification adjustments for (gains) losses included in net income (loss)	(15)	4	(12)	24
Net period other comprehensive income (loss)	(149)	64	(331)	(12)
Comprehensive income (loss)	$ (185)	$ 3	$ (440)	$ (179)