Consolidated Statements Of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statements of Comprehensive Income (Loss)
Net income (loss)	$ (78)	$ 69
Unrealized gains (losses) on available-for-sale securities: [Abstract]
Unrealized gains (losses) arising during the period	123	43
Provision (benefit) for income taxes	43	17
Total	80	26
Reclassification adjustments for (gains) losses included in net income (loss)	(5)	7
Provision (benefit) for income taxes	(2)	3
Total	(3)	4
Available-for-sale securities with other-than-temporary impairments: [Abstract]
Other-than-temporary impairments and unrealized gains (losses) arising during the period	(3)	(14)
Provision (benefit) for income taxes	(1)	(5)
Total	(2)	(9)
Foreign currency translation: [Abstract]
Foreign currency translation gains (losses)	(14)	(31)
Provision (benefit) for income taxes	(5)	(11)
Total	(9)	(20)
Reclassification adjustments for (gains) losses included in net income (loss)	0	0
Provision (benefit) for income taxes	0	0
Total	0	0
Total other comprehensive income (loss)	66	1
Comprehensive income (loss)	$ (12)	$ 70