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Investments - Recorded Investment in CMLs by LTV and DSC Ratio Categories (Details) - Commercial mortgage loans - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Unpaid Principal Balance	$ 1,990	$ 905
% of Total	100.00%	100.00%
Fair Value
Debt Securities, Available-for-sale [Line Items]
Unpaid Principal Balance	$ 2,010	$ 927
% of Total	100.00%	100.00%
Greater than 1.25
Debt Securities, Available-for-sale [Line Items]
Unpaid Principal Balance	$ 1,791	$ 878
1.00 - 1.25
Debt Securities, Available-for-sale [Line Items]
Unpaid Principal Balance	33	27
Greater than 1.00
Debt Securities, Available-for-sale [Line Items]
Unpaid Principal Balance	166	0
LTV Less Than 50 %
Debt Securities, Available-for-sale [Line Items]
Unpaid Principal Balance	$ 640	$ 538
% of Total	32.00%	60.00%
LTV Less Than 50 % | Fair Value
Debt Securities, Available-for-sale [Line Items]
Unpaid Principal Balance	$ 661	$ 557
% of Total	33.00%	60.00%
LTV Less Than 50 % | Greater than 1.25
Debt Securities, Available-for-sale [Line Items]
Unpaid Principal Balance	$ 441	$ 520
LTV Less Than 50 % | 1.00 - 1.25
Debt Securities, Available-for-sale [Line Items]
Unpaid Principal Balance	33	18
LTV Less Than 50 % | Greater than 1.00
Debt Securities, Available-for-sale [Line Items]
Unpaid Principal Balance	166	0
LTV 50 to 60%
Debt Securities, Available-for-sale [Line Items]
Unpaid Principal Balance	$ 386	$ 246
% of Total	19.00%	27.00%
LTV 50 to 60% | Fair Value
Debt Securities, Available-for-sale [Line Items]
Unpaid Principal Balance	$ 394	$ 251
% of Total	20.00%	27.00%
LTV 50 to 60% | Greater than 1.25
Debt Securities, Available-for-sale [Line Items]
Unpaid Principal Balance	$ 386	$ 237
LTV 50 to 60% | 1.00 - 1.25
Debt Securities, Available-for-sale [Line Items]
Unpaid Principal Balance	0	9
LTV 50 to 60% | Greater than 1.00
Debt Securities, Available-for-sale [Line Items]
Unpaid Principal Balance	0	0
LTV 60% to 75%
Debt Securities, Available-for-sale [Line Items]
Unpaid Principal Balance	$ 964	$ 121
% of Total	49.00%	13.00%
LTV 60% to 75% | Fair Value
Debt Securities, Available-for-sale [Line Items]
Unpaid Principal Balance	$ 955	$ 119
% of Total	47.00%	13.00%
LTV 60% to 75% | Greater than 1.25
Debt Securities, Available-for-sale [Line Items]
Unpaid Principal Balance	$ 964	$ 121
LTV 60% to 75% | 1.00 - 1.25
Debt Securities, Available-for-sale [Line Items]
Unpaid Principal Balance	0	0
LTV 60% to 75% | Greater than 1.00
Debt Securities, Available-for-sale [Line Items]
Unpaid Principal Balance	$ 0	$ 0

X

- Definition

Percentage, before allowance for credit loss, of financing receivable to total financing receivable.

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