Segment Information (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Summary of assets by segment
Total assets	$ 135,270	$ 132,307
Advice and Wealth Management
Summary of assets by segment
Total assets	12,715	12,293
Asset Management
Summary of assets by segment
Total assets	6,181	6,863
Annuities
Summary of assets by segment
Total assets	89,293	86,598
Protection
Summary of assets by segment
Total assets	18,311	18,304
Corporate and Other
Summary of assets by segment
Total assets	$ 8,770	$ 8,249