Segment Information (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Summary of assets by segment
Total assets	$ 147,470	$ 139,821
Advice & Wealth Management [Member]
Summary of assets by segment
Total assets	13,270	12,654
Asset Management [Member]
Summary of assets by segment
Total assets	8,393	7,254
Annuities [Member]
Summary of assets by segment
Total assets	98,276	93,481
Protection [Member]
Summary of assets by segment
Total assets	18,039	16,780
Corporate & Other [Member]
Summary of assets by segment
Total assets	$ 9,492	$ 9,652