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Investments - Available-for-Sale Securities by Type (Details) - Ameriprise Financial - USD ($) $ in Millions	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Investments
Amortized Cost	$ 53,006		$ 53,048
Gross Unrealized Gains	860		615
Gross Unrealized Losses	(1,444)		(2,099)
Allowance for Credit Losses	(5)	$ (5)	(2)	$ (1)	$ (9)	$ (22)
Fair Value	52,417		51,562
Accrued interest excluded from amortized cost basis	338		319
Corporate debt securities
Investments
Amortized Cost	14,059		12,675
Gross Unrealized Gains	518		409
Gross Unrealized Losses	(396)		(507)
Allowance for Credit Losses	0	0	(1)	0	(7)	(20)
Fair Value	14,181		12,576
Residential mortgage backed securities
Investments
Amortized Cost	23,598		22,130
Gross Unrealized Gains	221		107
Gross Unrealized Losses	(810)		(1,171)
Allowance for Credit Losses	0		0
Fair Value	23,009		21,066
Commercial mortgage backed securities
Investments
Amortized Cost	5,459		6,380
Gross Unrealized Gains	20		11
Gross Unrealized Losses	(192)		(341)
Allowance for Credit Losses	(4)	(4)	0	0	0	0
Fair Value	5,283		6,050
Asset backed securities
Investments
Amortized Cost	6,548		8,353
Gross Unrealized Gains	42		25
Gross Unrealized Losses	(32)		(59)
Allowance for Credit Losses	0		0
Fair Value	6,558		8,319
State and municipal obligations
Investments
Amortized Cost	646		719
Gross Unrealized Gains	56		62
Gross Unrealized Losses	(14)		(20)
Allowance for Credit Losses	(1)	$ (1)	(1)	$ (1)	$ (2)	$ (2)
Fair Value	687		760
U.S. government and agency obligations
Investments
Amortized Cost	2,683		2,739
Gross Unrealized Gains	3		1
Gross Unrealized Losses	0		0
Allowance for Credit Losses	0		0
Fair Value	2,686		2,740
Foreign government bonds and obligations
Investments
Amortized Cost	13		19
Gross Unrealized Gains	0		0
Gross Unrealized Losses	0		(1)
Allowance for Credit Losses	0		0
Fair Value	$ 13		18
Other securities
Investments
Amortized Cost			33
Gross Unrealized Gains			0
Gross Unrealized Losses			0
Allowance for Credit Losses			0
Fair Value			$ 33

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