Policyholders' Liabilities (Guaranteed Minimum Crediting Rate) (Details) $ in Thousands	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)		Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Policyholder Account Balance [Line Items]
Policyholders’ account balances	$ 53,012,800	$ 41,912,536	[1]	$ 35,730,680
1 - 50 bps above guaranteed minimum | Maximum
Policyholder Account Balance [Line Items]
Policyholder account balance, above guaranteed minimum crediting rate	50	50		50
1 - 50 bps above guaranteed minimum | Minimum
Policyholder Account Balance [Line Items]
Policyholder account balance, above guaranteed minimum crediting rate	1	1		1
51 - 150 bps above guaranteed minimum | Maximum
Policyholder Account Balance [Line Items]
Policyholder account balance, above guaranteed minimum crediting rate	150	150		150
51 - 150 bps above guaranteed minimum | Minimum
Policyholder Account Balance [Line Items]
Policyholder account balance, above guaranteed minimum crediting rate	51	51		51
Greater than 150bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholder account balance, above guaranteed minimum crediting rate	150	150		150
Fixed Annuities
Policyholder Account Balance [Line Items]
Policyholders’ account balances		$ 3,575,823		$ 3,005,867	$ 379,981
Variable Annuties
Policyholder Account Balance [Line Items]
Policyholders’ account balances		16,432,032		11,465,411	3,634,125
Variable / Universal Life
Policyholder Account Balance [Line Items]
Policyholders’ account balances		18,736,365		18,762,548	$ 18,363,958
Less than 1.00% | Fixed Annuities
Policyholder Account Balance [Line Items]
Policyholders’ account balances	$ 118,813	$ 0		$ 0
Range of Guaranteed Minimum Crediting Rates	1.00%	1.00%		1.00%
Less than 1.00% | Fixed Annuities | At guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	$ 105	$ 0		$ 0
Less than 1.00% | Fixed Annuities | 1 - 50 bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	337	0		0
Less than 1.00% | Fixed Annuities | 51 - 150 bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	994	0		0
Less than 1.00% | Fixed Annuities | Greater than 150bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	117,377	0		0
Less than 1.00% | Variable Annuties
Policyholder Account Balance [Line Items]
Policyholders’ account balances	$ 1,733,642	$ 1,888,628		$ 1,984,263
Range of Guaranteed Minimum Crediting Rates	1.00%	1.00%		1.00%
Less than 1.00% | Variable Annuties | At guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	$ 908,097	$ 1,008,763		$ 1,070,567
Less than 1.00% | Variable Annuties | 1 - 50 bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	807,460	861,119		894,487
Less than 1.00% | Variable Annuties | 51 - 150 bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	18,083	18,744		19,207
Less than 1.00% | Variable Annuties | Greater than 150bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	2	2		2
Less than 1.00% | Variable / Universal Life
Policyholder Account Balance [Line Items]
Policyholders’ account balances	$ 196,692	$ 11,902		$ 18,091
Range of Guaranteed Minimum Crediting Rates	1.00%	1.00%		1.00%
Less than 1.00% | Variable / Universal Life | At guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	$ 0	$ 11,902		$ 18,091
Less than 1.00% | Variable / Universal Life | 1 - 50 bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	0	0		0
Less than 1.00% | Variable / Universal Life | 51 - 150 bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	0	0		0
Less than 1.00% | Variable / Universal Life | Greater than 150bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	196,692	0		0
1.00% - 1.99% | Fixed Annuities
Policyholder Account Balance [Line Items]
Policyholders’ account balances	$ 874,784	$ 927,039		$ 9,470
1.00% - 1.99% | Fixed Annuities | Maximum
Policyholder Account Balance [Line Items]
Range of Guaranteed Minimum Crediting Rates	1.99%	1.99%		1.99%
1.00% - 1.99% | Fixed Annuities | Minimum
Policyholder Account Balance [Line Items]
Range of Guaranteed Minimum Crediting Rates	1.00%	1.00%		1.00%
1.00% - 1.99% | Fixed Annuities | At guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	$ 487,191	$ 521,189		$ 9,470
1.00% - 1.99% | Fixed Annuities | 1 - 50 bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	73,393	73,554		0
1.00% - 1.99% | Fixed Annuities | 51 - 150 bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	234,487	248,881		0
1.00% - 1.99% | Fixed Annuities | Greater than 150bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	79,713	83,415		0
1.00% - 1.99% | Variable Annuties
Policyholder Account Balance [Line Items]
Policyholders’ account balances	$ 217,498	$ 246,774		$ 269,036
1.00% - 1.99% | Variable Annuties | Maximum
Policyholder Account Balance [Line Items]
Range of Guaranteed Minimum Crediting Rates	1.99%	1.99%		1.99%
1.00% - 1.99% | Variable Annuties | Minimum
Policyholder Account Balance [Line Items]
Range of Guaranteed Minimum Crediting Rates	1.00%	1.00%		1.00%
1.00% - 1.99% | Variable Annuties | At guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	$ 214,377	$ 243,223		$ 267,409
1.00% - 1.99% | Variable Annuties | 1 - 50 bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	2,061	2,257		1,627
1.00% - 1.99% | Variable Annuties | 51 - 150 bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	1,060	1,294		0
1.00% - 1.99% | Variable Annuties | Greater than 150bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	0	0		0
1.00% - 1.99% | Variable / Universal Life
Policyholder Account Balance [Line Items]
Policyholders’ account balances	$ 3,317,734	$ 3,120,332		$ 2,918,031
1.00% - 1.99% | Variable / Universal Life | Maximum
Policyholder Account Balance [Line Items]
Range of Guaranteed Minimum Crediting Rates	1.99%	1.99%		1.99%
1.00% - 1.99% | Variable / Universal Life | Minimum
Policyholder Account Balance [Line Items]
Range of Guaranteed Minimum Crediting Rates	1.00%	1.00%		1.00%
1.00% - 1.99% | Variable / Universal Life | At guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	$ 201,121	$ 418,399		$ 380,144
1.00% - 1.99% | Variable / Universal Life | 1 - 50 bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	0	0		0
1.00% - 1.99% | Variable / Universal Life | 51 - 150 bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	2,588,458	773,591		0
1.00% - 1.99% | Variable / Universal Life | Greater than 150bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	528,155	1,928,342		2,537,887
2.00% - 2.99% | Fixed Annuities
Policyholder Account Balance [Line Items]
Policyholders’ account balances	$ 1,349,636	$ 208,420		$ 213,321
2.00% - 2.99% | Fixed Annuities | Maximum
Policyholder Account Balance [Line Items]
Range of Guaranteed Minimum Crediting Rates	2.99%	2.99%		2.99%
2.00% - 2.99% | Fixed Annuities | Minimum
Policyholder Account Balance [Line Items]
Range of Guaranteed Minimum Crediting Rates	2.00%	2.00%		2.00%
2.00% - 2.99% | Fixed Annuities | At guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	$ 301,132	$ 208,420		$ 213,321
2.00% - 2.99% | Fixed Annuities | 1 - 50 bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	469,276	0		0
2.00% - 2.99% | Fixed Annuities | 51 - 150 bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	562,347	0		0
2.00% - 2.99% | Fixed Annuities | Greater than 150bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	16,881	0		0
2.00% - 2.99% | Variable Annuties
Policyholder Account Balance [Line Items]
Policyholders’ account balances	$ 31,529	$ 27,751		$ 30,800
2.00% - 2.99% | Variable Annuties | Maximum
Policyholder Account Balance [Line Items]
Range of Guaranteed Minimum Crediting Rates	2.99%	2.99%		2.99%
2.00% - 2.99% | Variable Annuties | Minimum
Policyholder Account Balance [Line Items]
Range of Guaranteed Minimum Crediting Rates	2.00%	2.00%		2.00%
2.00% - 2.99% | Variable Annuties | At guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	$ 23,323	$ 26,778		$ 30,738
2.00% - 2.99% | Variable Annuties | 1 - 50 bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	4,071	973		62
2.00% - 2.99% | Variable Annuties | 51 - 150 bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	4,135	0		0
2.00% - 2.99% | Variable Annuties | Greater than 150bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	0	0		0
2.00% - 2.99% | Variable / Universal Life
Policyholder Account Balance [Line Items]
Policyholders’ account balances	$ 4,523,671	$ 4,391,725		$ 4,298,598
2.00% - 2.99% | Variable / Universal Life | Maximum
Policyholder Account Balance [Line Items]
Range of Guaranteed Minimum Crediting Rates	2.99%	2.99%		2.99%
2.00% - 2.99% | Variable / Universal Life | Minimum
Policyholder Account Balance [Line Items]
Range of Guaranteed Minimum Crediting Rates	2.00%	2.00%		2.00%
2.00% - 2.99% | Variable / Universal Life | At guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	$ 28,061	$ 32,651		$ 10,227
2.00% - 2.99% | Variable / Universal Life | 1 - 50 bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	1,445,439	121,200		0
2.00% - 2.99% | Variable / Universal Life | 51 - 150 bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	2,789,520	2,413,571		3,735,376
2.00% - 2.99% | Variable / Universal Life | Greater than 150bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	260,651	1,824,303		552,995
3.00% - 4.00% | Fixed Annuities
Policyholder Account Balance [Line Items]
Policyholders’ account balances	$ 29,131	$ 38,195		$ 42,418
3.00% - 4.00% | Fixed Annuities | Maximum
Policyholder Account Balance [Line Items]
Range of Guaranteed Minimum Crediting Rates	4.00%	4.00%		4.00%
3.00% - 4.00% | Fixed Annuities | Minimum
Policyholder Account Balance [Line Items]
Range of Guaranteed Minimum Crediting Rates	3.00%	3.00%		3.00%
3.00% - 4.00% | Fixed Annuities | At guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	$ 29,131	$ 38,195		$ 42,418
3.00% - 4.00% | Fixed Annuities | 1 - 50 bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	0	0		0
3.00% - 4.00% | Fixed Annuities | 51 - 150 bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	0	0		0
3.00% - 4.00% | Fixed Annuities | Greater than 150bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	0	0		0
3.00% - 4.00% | Variable Annuties
Policyholder Account Balance [Line Items]
Policyholders’ account balances	$ 913,231	$ 1,073,205		$ 1,150,448
3.00% - 4.00% | Variable Annuties | Maximum
Policyholder Account Balance [Line Items]
Range of Guaranteed Minimum Crediting Rates	4.00%	4.00%		4.00%
3.00% - 4.00% | Variable Annuties | Minimum
Policyholder Account Balance [Line Items]
Range of Guaranteed Minimum Crediting Rates	3.00%	3.00%		3.00%
3.00% - 4.00% | Variable Annuties | At guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	$ 903,953	$ 1,070,958		$ 1,150,448
3.00% - 4.00% | Variable Annuties | 1 - 50 bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	9,245	2,247		0
3.00% - 4.00% | Variable Annuties | 51 - 150 bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	33	0		0
3.00% - 4.00% | Variable Annuties | Greater than 150bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	0	0		0
3.00% - 4.00% | Variable / Universal Life
Policyholder Account Balance [Line Items]
Policyholders’ account balances	$ 7,281,490	$ 6,964,283		$ 7,239,126
3.00% - 4.00% | Variable / Universal Life | Maximum
Policyholder Account Balance [Line Items]
Range of Guaranteed Minimum Crediting Rates	4.00%	4.00%		4.00%
3.00% - 4.00% | Variable / Universal Life | Minimum
Policyholder Account Balance [Line Items]
Range of Guaranteed Minimum Crediting Rates	3.00%	3.00%		3.00%
3.00% - 4.00% | Variable / Universal Life | At guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	$ 3,956,631	$ 4,737,864		$ 4,793,734
3.00% - 4.00% | Variable / Universal Life | 1 - 50 bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	2,217,133	3,510		2,048,590
3.00% - 4.00% | Variable / Universal Life | 51 - 150 bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	1,107,726	2,093,511		343,129
3.00% - 4.00% | Variable / Universal Life | Greater than 150bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	0	129,398		53,673
Greater than 4.00% | Fixed Annuities
Policyholder Account Balance [Line Items]
Policyholders’ account balances	$ 0	$ 0		$ 0
Range of Guaranteed Minimum Crediting Rates	4.00%	4.00%		4.00%
Greater than 4.00% | Fixed Annuities | At guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	$ 0	$ 0		$ 0
Greater than 4.00% | Fixed Annuities | 1 - 50 bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	0	0		0
Greater than 4.00% | Fixed Annuities | 51 - 150 bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	0	0		0
Greater than 4.00% | Fixed Annuities | Greater than 150bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	0	0		0
Greater than 4.00% | Variable Annuties
Policyholder Account Balance [Line Items]
Policyholders’ account balances	$ 2,046	$ 2,172		$ 2,415
Range of Guaranteed Minimum Crediting Rates	4.00%	4.00%		4.00%
Greater than 4.00% | Variable Annuties | At guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	$ 2,046	$ 2,172		$ 2,415
Greater than 4.00% | Variable Annuties | 1 - 50 bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	0	0		0
Greater than 4.00% | Variable Annuties | 51 - 150 bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	0	0		0
Greater than 4.00% | Variable Annuties | Greater than 150bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	0	0		0
Greater than 4.00% | Variable / Universal Life
Policyholder Account Balance [Line Items]
Policyholders’ account balances	$ 2,136,137	$ 2,145,123		$ 2,092,925
Range of Guaranteed Minimum Crediting Rates	4.00%	4.00%		4.00%
Greater than 4.00% | Variable / Universal Life | At guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	$ 2,136,137	$ 2,145,123		$ 2,092,925
Greater than 4.00% | Variable / Universal Life | 1 - 50 bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	0	0		0
Greater than 4.00% | Variable / Universal Life | 51 - 150 bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	0	0		0
Greater than 4.00% | Variable / Universal Life | Greater than 150bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	0	0		0
Total | Fixed Annuities
Policyholder Account Balance [Line Items]
Policyholders’ account balances	2,372,364	1,173,654		265,209
Total | Fixed Annuities | At guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	817,559	767,804		265,209
Total | Fixed Annuities | 1 - 50 bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	543,006	73,554		0
Total | Fixed Annuities | 51 - 150 bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	797,828	248,881		0
Total | Fixed Annuities | Greater than 150bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	213,971	83,415		0
Total | Variable Annuties
Policyholder Account Balance [Line Items]
Policyholders’ account balances	2,897,946	3,238,530		3,436,962
Total | Variable Annuties | At guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	2,051,796	2,351,894		2,521,577
Total | Variable Annuties | 1 - 50 bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	822,837	866,596		896,176
Total | Variable Annuties | 51 - 150 bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	23,311	20,038		19,207
Total | Variable Annuties | Greater than 150bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	2	2		2
Total | Variable / Universal Life
Policyholder Account Balance [Line Items]
Policyholders’ account balances	17,455,724	16,633,365		16,566,771
Total | Variable / Universal Life | At guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	6,321,950	7,345,939		7,295,121
Total | Variable / Universal Life | 1 - 50 bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	3,662,572	124,710		2,048,590
Total | Variable / Universal Life | 51 - 150 bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	6,485,704	5,280,673		4,078,505
Total | Variable / Universal Life | Greater than 150bps above guaranteed minimum
Policyholder Account Balance [Line Items]
Policyholders’ account balances	$ 985,498	$ 3,882,043		$ 3,144,555

[1] Prior period amounts reflect the implementation of Accounting Standard Update ("ASU") 2018-12: Targeted Improvements to the Accounting for Long-Duration Contracts.