CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
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	332,390,132	329,842,827
Treasury shares	215,624,519	205,903,593
Common shares, shares authorized	1,250,000,000	1,250,000,000
Common shares, shares issued	332,390,132	329,842,827
Common shares, par value (in dollars per share)	$ 0.01	$ 0.01
Treasury shares	215,624,519	205,903,593
Ameriprise Financial [Member]
Investments, Allowance for Credit Losses	$ 52	$ 24