Consolidated Statement Of Comprehensive Income (Loss) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income (Loss)
Net income (loss)	$ 69	$ 256
Unrealized gains (losses) on available-for-sale securities: [Abstract]
Unrealized gains (losses) arising during the period	43	105
Provision (benefit) for income taxes	17	38
Total	26	67
Reclassification adjustments for (gains) losses included in net income (loss)	7	2
Provision (benefit) for income taxes	3	1
Total	4	1
Available-for-sale securities with other-than-temporary impairments: [Abstract]
Other-than-temporary impairments and unrealized gains (losses) arising during the period	(14)	3
Provision (benefit) for income taxes	(5)	0
Total	(9)	3
Foreign currency translation: [Abstract]
Foreign currency translation gains (losses)	(31)	(2)
Provision (benefit) for income taxes	(11)	0
Total	(20)	(2)
Reclassification adjustments for (gains) losses included in net income (loss)	0	4
Provision (benefit) for income taxes	0	0
Total	0	4
Total other comprehensive income (loss)	1	73
Comprehensive income (loss)	$ 70	$ 329