Segment Information - Total Assets (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Summary of assets by segment
Total assets	$ 143,144	$ 139,821
Advice and Wealth Management [Member]
Summary of assets by segment
Total assets	13,084	12,654
Asset Management [Member]
Summary of assets by segment
Total assets	7,940	7,254
Annuities [Member]
Summary of assets by segment
Total assets	95,364	93,481
Protection [Member]
Summary of assets by segment
Total assets	17,236	16,780
Corporate and Other [Member]
Summary of assets by segment
Total assets	$ 9,520	$ 9,652