Segment Information (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Summary of assets by segment
Total assets	$ 137,296	$ 134,729
Advice and Wealth Management
Summary of assets by segment
Total assets	8,938	8,962
Asset Management
Summary of assets by segment
Total assets	6,455	6,267
Annuities
Summary of assets by segment
Total assets	93,249	91,587
Protection
Summary of assets by segment
Total assets	19,537	19,065
Corporate and Other
Summary of assets by segment
Total assets	$ 9,117	$ 8,848