Segment Information - Total Assets (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Summary of assets by segment
Total assets	$ 158,687	$ 151,828
Advice and Wealth Management [Member]
Summary of assets by segment
Total assets	20,558	17,607
Asset Management [Member]
Summary of assets by segment
Total assets	8,143	8,226
Retirement & Protection Solutions [Member]
Summary of assets by segment
Total assets	107,411	104,227
Corporate and Other [Member]
Summary of assets by segment
Total assets	$ 22,575	$ 21,768