Consolidated Statement Of Comprehensive Income (Loss) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Statement of Comprehensive Income (Loss)
Net income (loss)	$ 256	$ 164
Unrealized gains (losses) on available-for-sale securities: [Abstract]
Unrealized gains (losses) arising during the period	105	13
Provision (benefit) for income taxes	38	4
Total	67	9
Reclassification adjustments for (gains) losses included in net income (loss)	2	(25)
Provision (benefit) for income taxes	1	(9)
Total	1	(16)
Available-for-sale securities with other-than-temporary impairments: [Abstract]
Other-than-temporary impairments and unrealized gains (losses) arising during the period	3	5
Provision (benefit) for income taxes	0	2
Total	3	3
Reclassification adjustments for (gains) losses included in net income (loss)	0	0
Provision (benefit) for income taxes	0	0
Total	0	0
Foreign currency translation: [Abstract]
Foreign currency translation gains (losses)	(2)	(43)
Provision (benefit) for income taxes	0	0
Total	(2)	(43)
Reclassification adjustments for (gains) losses included in net income (loss)	4	0
Total	4	0
Total other comprehensive income (loss)	73	(47)
Comprehensive income (loss)	$ 329	$ 117