Condensed Financial Information of Parent Company - Statements of Income (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues
Investment Income									$ 1,465	$ 1,556	$ 1,644
Other Revenues									14	8	9
Realized Investment Gains (Losses), Net									402	193	288
TOTAL REVENUES	3,476	3,403	3,551	3,517	3,400	3,362	3,423	3,410	13,947	13,595	13,585
Expenses
Corporate Expenses									254	270	287
Investment Expenses									49	38	39
Other Expenses									22	11	11
Federal and Foreign Income Tax	217	198	217	260	(39)	194	123	173	892	451	521
NET INCOME	569	541	579	656	102	533	404	506	2,345	1,545	1,678
Other Comprehensive Income (Loss), Net of Tax									(396)	236	405
COMPREHENSIVE INCOME									1,949	1,781	2,083
Parent Company [Member]
Revenues
Investment Income									29	38	46
Other Revenues									6
Realized Investment Gains (Losses), Net									99	(6)	9
TOTAL REVENUES									134	32	55
Expenses
Corporate Expenses									262	268	285
Investment Expenses									4	2	3
Other Expenses									8
TOTAL EXPENSES									274	270	288
Loss before Federal and Foreign Income Tax and Equity in Net Income of Consolidated Subsidiaries									(140)	(238)	(233)
Federal and Foreign Income Tax										4	1
Loss before Equity in Net Income of Consolidated Subsidiaries									(140)	(242)	(234)
Equity in Net Income of Consolidated Subsidiaries									2,485	1,787	1,912
NET INCOME									2,345	1,545	1,678
Other Comprehensive Income (Loss), Net of Tax									(396)	236	405
COMPREHENSIVE INCOME									$ 1,949	$ 1,781	$ 2,083