Other Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Pre-tax
Unrealized net holding gains and losses arising during the period, net of related offsets	$ 492	$ 21
Less: reclassification adjustment of realized capital gains and losses	(9)	(18)
Unrealized net capital gains and losses	501	39
Unrealized foreign currency translation adjustments	2	2
Other comprehensive income	503	41
Tax
Unrealized net holding gains and losses arising during the period, net of related offsets	(173)	(7)
Less: reclassification adjustment of realized capital gains and losses	3	6
Unrealized net capital gains and losses	(176)	(13)
Unrealized foreign currency translation adjustments	(1)	(1)
Other comprehensive income	(177)	(14)
After-tax
Unrealized net holding gains and losses arising during the period, net of related offsets	319	14
Less: reclassification adjustment of realized capital gains and losses	(6)	(12)
Unrealized net capital gains and losses	325	26
Unrealized foreign currency translation adjustments	1	1
Other comprehensive income, after-tax	326	27
Net income	127	109
Comprehensive income	$ 453	$ 136