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Mortgage Loans on Real Estate - Aging of Financing Receivables (Details) - Mortgage Receivable - USD ($) $ in Millions	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
2024	$ 281		$ 319
2023	1,516		1,562
2022	3,570		679
2021	1,543		489
2020	1,128		493
Prior	4,058		2,169
Amortized cost	12,096		5,711
Allowance for credit losses	(54)	$ (54)	(53)	$ (43)	$ (49)	$ (38)
Mortgage loans, carrying value	12,042		5,658
Commercial Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2024	214		319
2023	420		1,562
2022	2,265		679
2021	1,255		489
2020	983		493
Prior	4,038		2,169
Amortized cost	9,175		5,711
Allowance for credit losses	(54)	(54)	(53)	(43)	(49)	(38)
Mortgage loans, carrying value	9,121		5,658
Commercial Mortgage \| Current
Financing Receivable, Credit Quality Indicator [Line Items]
2024	214		319
2023	415		1,486
2022	2,215		679
2021	1,254		489
2020	983		488
Prior	3,867		2,120
Amortized cost	8,948		5,581
Commercial Mortgage \| 30 - 59 days past due
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0		0
2023	0		26
2022	0		0
2021	0		0
2020	0		5
Prior	24		21
Amortized cost	24		52
Commercial Mortgage \| 60 - 89 days past due
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0		0
2023	2		50
2022	50		0
2021	0		0
2020	0		0
Prior	42		13
Amortized cost	94		63
Commercial Mortgage \| Non-accrual (90 days or more past due)
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0		0
2023	3		0
2022	0		0
2021	1		0
2020	0		0
Prior	105		15
Amortized cost	109		15
Residential Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2024	67		0
2023	1,096		0
2022	1,305		0
2021	288		0
2020	145		0
Prior	20		0
Amortized cost	2,921		0
Allowance for credit losses	0	$ 0	0	$ 0	$ 0	$ 0
Mortgage loans, carrying value	2,921		0
Residential Mortgage \| Current
Financing Receivable, Credit Quality Indicator [Line Items]
2024	64		0
2023	1,030		0
2022	1,193		0
2021	251		0
2020	127		0
Prior	17		0
Amortized cost	2,682		0
Residential Mortgage \| 30 - 59 days past due
Financing Receivable, Credit Quality Indicator [Line Items]
2024	3		0
2023	16		0
2022	41		0
2021	10		0
2020	5		0
Prior	0		0
Amortized cost	75		0
Residential Mortgage \| 60 - 89 days past due
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0		0
2023	14		0
2022	21		0
2021	7		0
2020	4		0
Prior	1		0
Amortized cost	47		0
Residential Mortgage \| Non-accrual (90 days or more past due)
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0		0
2023	36		0
2022	50		0
2021	20		0
2020	9		0
Prior	2		0
Amortized cost	$ 117		$ 0