Fair Values of Assets and Liabilities (Level 3 rollforwards-Assets) (Details 2) - Ameriprise Financial [Member] - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Corporate debt securities [Member]
Summary of changes in Level 3 assets measured at fair value on a recurring basis [Rollforward]
Balance, at the beginning of the period		$ 772	$ 750
Total gains (losses) included in other comprehensive income (loss)		(5)	(6)
Purchases		46	5
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements		(1)	(15)
Balance, at the end of the period		812	734
Changes in unrealized gains (losses) OCI relating to assets held at end of period		(5)	(6)
Residential mortgage backed securities [Member]
Summary of changes in Level 3 assets measured at fair value on a recurring basis [Rollforward]
Balance, at the beginning of the period		9	17
Purchases		78
Balance, at the end of the period		87	17
Asset backed securities [Member]
Summary of changes in Level 3 assets measured at fair value on a recurring basis [Rollforward]
Balance, at the beginning of the period		32	19
Total gains (losses) included in net income		(1)	(1)
Total gains (losses) included in other comprehensive income (loss)			(1)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements		(1)
Balance, at the end of the period		30	17
Changes in unrealized gains (losses) relating to assets held at end of period		(1)	(1)
Changes in unrealized gains (losses) OCI relating to assets held at end of period			(1)
Available-for-sale securities [Member]
Summary of changes in Level 3 assets measured at fair value on a recurring basis [Rollforward]
Balance, at the beginning of the period		813	786
Total gains (losses) included in net income	[1]	(1)	(1)
Total gains (losses) included in other comprehensive income (loss)		(5)	(7)
Purchases		124	5
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements		(2)	(15)
Balance, at the end of the period		929	768
Changes in unrealized gains (losses) relating to assets held at end of period	[1]	(1)	(1)
Changes in unrealized gains (losses) OCI relating to assets held at end of period		$ (5)	$ (7)

[1] Included in general and administrative expense in the Consolidated Statements of Operations.