Schedule II (details) - Condensed Income Statement (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Condensed Statement of Income
Net investment income									$ 2,787		$ 2,716		$ 2,889
Net realized investment gains									79	[1]	166	[1]	51	[1]
Other revenues									145		277		120
Total revenues	6,783	6,886	6,785	6,708	6,737	6,452	6,674	6,328	27,162		26,191		25,740
Interest expense									369		361		378
Expenses, other									3,952		3,757		3,610
Total claims and expenses	5,323	5,628	5,884	5,238	5,366	5,275	5,497	5,108	22,073		21,246		22,574
Income before income taxes	1,460	1,258	901	1,470	1,371	1,177	1,177	1,220	5,089		4,945		3,166
Income tax expense (benefit)	422	339	218	418	383	313	252	324	1,397		1,272		693
Net income	1,038	919	683	1,052	988	864	925	896	3,692		3,673		2,473
Other-than-temporary impairment losses recognized in net realized investment gains									(26)		(15)		(15)
Other-than-temporary impairment gains (losses) recognized in other comprehensive income									4		5		42
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Condensed Statement of Income
Net investment income									6		7		9
Net realized investment gains									3		2
Other revenues													(1)
Total revenues									9		9		8
Interest expense									321		308		305
Expenses, other									15		13		4
Total claims and expenses									336		321		309
Income before income taxes									(327)		(312)		(301)
Income tax expense (benefit)									(115)		(170)		(119)
Loss before net income of subsidiaries									(212)		(142)		(182)
Net income of subsidiaries									3,904		3,815		2,655
Net income									3,692		3,673		2,473
Other-than-temporary impairment losses recognized in net realized investment gains									0		0		0
Other-than-temporary impairment gains (losses) recognized in other comprehensive income									$ 0		$ 0		$ 0

[1] Total other-than-temporary impairment (OTTI) gains (losses) were $(22) million, $(10) million and $27 million for the years ended December 31, 2014, 2013 and 2012, respectively. Of total OTTI, credit losses of $(26) million, $(15) million and $(15) million for the years ended December 31, 2014, 2013 and 2012 respectively, were recognized in net realized investment gains. In addition, unrealized gains from other changes in total OTTI of $4 million, $5 million and $42 million for the years ended December 31, 2014, 2013 and 2012, respectively, were recognized in other comprehensive income (loss) as part of changes in net unrealized gains on investment securities having credit losses recognized in the consolidated statement of income.