Acquisitions and Dispositions (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Discontinued Investment Management Operations [Abstract]
Purchase price adjustment	$ (58)
Disposal
Gain (loss) on disposal, before federal income taxes	(1)	(3)	66
Discontinued Investment Management Operations [Member]
Revenues:
Gain (loss) on sale of business	0	0	4
Total revenues	0	0	4
Income (loss) from discontinued operations before disposal, before federal income taxes	0	0	(13)
Federal income tax expense (benefit)	0	0	(2)
Income (loss) from discontinued operations before disposal	0	0	(11)
Disposal
Gain (loss) on disposal, before federal income taxes	(1)	(3)	37
Federal income tax expense (benefit)	(28)	5	13
Gain (loss) on disposal	27	(8)	24
Income (loss) from discontinued operations	27	(8)	13
Discontinued Lincoln UK Operations [Member]
Disposal
Gain (loss) on disposal, before federal income taxes	29
Federal income tax expense (benefit)	13
Gain (loss) on disposal	16
Income (loss) from discontinued operations	$ 16