Consolidated Statements Of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Statements of Comprehensive Income (Loss)
Net income (loss)	$ (72)	$ (78)
Unrealized gains (losses) on available-for-sale securities: [Abstract]
Unrealized gains (losses) arising during the period	(40)	123
Provision (benefit) for income taxes	(6)	43
Total	(34)	80
Reclassification adjustments for (gains) losses included in net income (loss)	(2)	(5)
Provision (benefit) for income taxes	(1)	(2)
Total	(1)	(3)
Available-for-sale securities with other-than-temporary impairments: [Abstract]
Other-than-temporary impairments and unrealized gains (losses) arising during the period	13	(3)
Provision (benefit) for income taxes	5	(1)
Total	8	(2)
Reclassification adjustments for (gains) losses included in net income (loss)	2	0
Provision (benefit) for income taxes	1	0
Total	1	0
Foreign currency translation: [Abstract]
Foreign currency translation gains (losses)	144	(14)
Provision (benefit) for income taxes	21	(5)
Total	123	(9)
Total other comprehensive income (loss)	97	66
Comprehensive income (loss)	$ 25	$ (12)

Amount before tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities with other-than-temporary impairments and for unrealized loss realized upon the write-down of available-for-sale securities.

No definition available.