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Mortgage Loans on Real Estate - Aging of Financing Receivables (Details) - Mortgage loans on real estate, at amortized cost - USD ($) $ in Millions	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
2024	$ 552		$ 319
2023	1,389		1,562
2022	3,442		679
2021	1,531		489
2020	1,130		493
Prior	3,910		2,169
Amortized cost	11,954		5,711
Allowance for credit losses	(88)	$ (54)	(53)	$ (31)	$ (43)	$ (38)
Mortgage loans, carrying value	11,866		5,658
Commercial Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2024	380		319
2023	386		1,562
2022	2,246		679
2021	1,273		489
2020	990		493
Prior	3,894		2,169
Amortized cost	9,169		5,711
Allowance for credit losses	(80)	(54)	(53)	(31)	(43)	(38)
Mortgage loans, carrying value	9,089		5,658
Commercial Mortgage \| Current
Financing Receivable, Credit Quality Indicator [Line Items]
2024	376		319
2023	375		1,486
2022	2,154		679
2021	1,260		489
2020	980		488
Prior	3,704		2,120
Amortized cost	8,849		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	0		21
Amortized cost	0		52
Commercial Mortgage \| 60 - 89 days past due
Financing Receivable, Credit Quality Indicator [Line Items]
2024	4		0
2023	0		50
2022	50		0
2021	0		0
2020	4		0
Prior	105		13
Amortized cost	163		63
Commercial Mortgage \| Non-accrual (90 days or more past due)
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0		0
2023	11		0
2022	42		0
2021	13		0
2020	6		0
Prior	85		15
Amortized cost	157		15
Residential Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2024	172		0
2023	1,003		0
2022	1,196		0
2021	258		0
2020	140		0
Prior	16		0
Amortized cost	2,785		0
Allowance for credit losses	(8)	$ 0	0	$ 0	$ 0	$ 0
Mortgage loans, carrying value	2,777		0
Residential Mortgage \| Current
Financing Receivable, Credit Quality Indicator [Line Items]
2024	165		0
2023	929		0
2022	1,072		0
2021	227		0
2020	124		0
Prior	13		0
Amortized cost	2,530		0
Residential Mortgage \| 30 - 59 days past due
Financing Receivable, Credit Quality Indicator [Line Items]
2024	6		0
2023	21		0
2022	48		0
2021	4		0
2020	4		0
Prior	0		0
Amortized cost	83		0
Residential Mortgage \| 60 - 89 days past due
Financing Receivable, Credit Quality Indicator [Line Items]
2024	1		0
2023	6		0
2022	21		0
2021	6		0
2020	4		0
Prior	0		0
Amortized cost	38		0
Residential Mortgage \| Non-accrual (90 days or more past due)
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0		0
2023	47		0
2022	55		0
2021	21		0
2020	8		0
Prior	3		0
Amortized cost	$ 134		$ 0