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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