Schedule II (Condensed Statements Of Comprehensive Income (Loss)) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net income (loss)	$ 250	$ 1,234	$ (1,319)
Unrealized gains (losses) on available-for-sale securities: [Abstract]
Unrealized gains (losses) arising during the period	(213)	176	277
Provision (benefit) for income taxes	(76)	72	93
Total	(137)	104	184
Reclassification adjustments for (gains) losses included in net income (loss)	(13)	39	64
Provision (benefit) for income taxes	(5)	14	22
Total	(8)	25	42
Available-for-sale securities with other-than-temporary impairments: [Abstract]
Other-than-temporary impairments and unrealized gains (losses) arising during the period	15	50	(8)
Provision (benefit) for income taxes	6	18	(3)
Total	9	32	(5)
Reclassification adjustments for (gains) losses included in net income (loss)	(5)	69	34
Provision (benefit) for income taxes	(2)	24	12
Total	(3)	45	22
Foreign currency translation: [Abstract]
Foreign currency translation gains (losses)	3	24	(13)
Provision (benefit) for income taxes	1	(2)	0
Total	2	26	(13)
Total other comprehensive income (loss)	(142)	232	230
Comprehensive income (loss)	108	1,466	(1,089)
Parent Company [Member]
Net income (loss)	250	1,234	(1,376)
Unrealized gains (losses) on available-for-sale securities: [Abstract]
Unrealized gains (losses) arising during the period	(179)	166	287
Provision (benefit) for income taxes	(17)	36	58
Total	(162)	130	229
Reclassification adjustments for (gains) losses included in net income (loss)	23	111	61
Provision (benefit) for income taxes	8	39	21
Total	15	72	40
Available-for-sale securities with other-than-temporary impairments: [Abstract]
Other-than-temporary impairments and unrealized gains (losses) arising during the period	12	38	41
Provision (benefit) for income taxes	4	13	14
Total	8	25	27
Reclassification adjustments for (gains) losses included in net income (loss)	0	31	29
Provision (benefit) for income taxes	0	11	10
Total	0	20	19
Foreign currency translation: [Abstract]
Total	(3)	(15)	(33)
Total other comprehensive income (loss)	(142)	232	282
Comprehensive income (loss)	$ 108	$ 1,466	$ (1,094)