Consolidated Statements Of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statements of Comprehensive Income (Loss)
Net income (loss)	$ (123)	$ (58)	$ (290)	$ (497)
Available-for-sale securities with no credit losses:
Unrealized gains (losses) arising during the period	(10)	5	(42)	93
Reclassification adjustments for (gains) losses included in net income (loss)	(3)	(9)	(11)	(17)
Foreign currency translation:
Foreign currency translation gains (losses)	0	(2)	3	(3)
Instrument-specific credit risk of liabilities measured at fair value:
Unrealized gains (losses) arising during the period	(12)	5	(11)	54
Reclassification adjustments for (gains) losses included in net income (loss)	12	2	36	5
Total other comprehensive income (loss)	(13)	1	(25)	132
Comprehensive income (loss)	$ (136)	$ (57)	$ (315)	$ (365)