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Investments - Recorded Investment in CMLs by LTV and DSC Ratio Categories (Details) - Commercial Mortgage - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Loans	$ 2,174	$ 905
% of Total	100.00%	100.00%
Fair Value
Debt Securities, Available-for-sale [Line Items]
Loans	$ 2,265	$ 927
% of Total	100.00%	100.00%
Greater than 1.25
Debt Securities, Available-for-sale [Line Items]
Loans	$ 2,132	$ 878
Greater than 1.00 but less than 1.25
Debt Securities, Available-for-sale [Line Items]
Loans	33	27
Greater than 1.00
Debt Securities, Available-for-sale [Line Items]
Loans	9	0
Less than 50%
Debt Securities, Available-for-sale [Line Items]
Loans	$ 668	$ 537
% of Total	31.00%	60.00%
Less than 50% | Fair Value
Debt Securities, Available-for-sale [Line Items]
Loans	$ 745	$ 557
% of Total	33.00%	60.00%
Less than 50% | Greater than 1.25
Debt Securities, Available-for-sale [Line Items]
Loans	$ 626	$ 519
Less than 50% | Greater than 1.00 but less than 1.25
Debt Securities, Available-for-sale [Line Items]
Loans	33	18
Less than 50% | Greater than 1.00
Debt Securities, Available-for-sale [Line Items]
Loans	9	0
LTV 50 to 60 Percent
Debt Securities, Available-for-sale [Line Items]
Loans	$ 470	$ 246
% of Total	22.00%	27.00%
LTV 50 to 60 Percent | Fair Value
Debt Securities, Available-for-sale [Line Items]
Loans	$ 481	$ 251
% of Total	21.00%	27.00%
LTV 50 to 60 Percent | Greater than 1.25
Debt Securities, Available-for-sale [Line Items]
Loans	$ 470	$ 237
LTV 50 to 60 Percent | Greater than 1.00 but less than 1.25
Debt Securities, Available-for-sale [Line Items]
Loans	0	9
LTV 50 to 60 Percent | Greater than 1.00
Debt Securities, Available-for-sale [Line Items]
Loans	0	0
LTV 60 to 75 Percent
Debt Securities, Available-for-sale [Line Items]
Loans	$ 1,036	$ 122
% of Total	47.00%	13.00%
LTV 60 to 75 Percent | Fair Value
Debt Securities, Available-for-sale [Line Items]
Loans	$ 1,039	$ 119
% of Total	46.00%	13.00%
LTV 60 to 75 Percent | Greater than 1.25
Debt Securities, Available-for-sale [Line Items]
Loans	$ 1,036	$ 122
LTV 60 to 75 Percent | Greater than 1.00 but less than 1.25
Debt Securities, Available-for-sale [Line Items]
Loans	0	0
LTV 60 to 75 Percent | Greater than 1.00
Debt Securities, Available-for-sale [Line Items]
Loans	$ 0	$ 0

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

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