CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Common shares, shares authorized	1,250,000,000	1,250,000,000
Equity:
Common shares, par value (in dollars per share)	$ 0.01	$ 0.01
Common shares, shares authorized	1,250,000,000	1,250,000,000
Common shares, shares issued	333,819,446	332,390,132
Treasury shares	217,831,175	215,624,519
Ameriprise Financial [Member]
Assets
Investments, Allowance for Credit Losses	$ 39	$ 52
Receivable, Allowance for Credit Loss	$ 50	$ 49