Derivative Instruments (Financial Statement Classification and Impact of Derivatives Used in Qualifying and Non-qualifying Hedge Relationships) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Realized investment gains (losses), net
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	$ (1,069,780)	$ 507,313	$ (382,531)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Realized investment gains (losses), net	Realized investment gains (losses), net	Realized investment gains (losses), net
Market Risk Benefit, Increase (Decrease)
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	$ (2,377,803)	$ (4,179,946)	$ (611,938)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Change in value of market risk benefits, net of related hedging gain (losses)	Change in value of market risk benefits, net of related hedging gain (losses)	Change in value of market risk benefits, net of related hedging gain (losses)
Investment Income
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	$ 43,816	$ 36,726	$ 16,030
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Net investment income	Net investment income	Net investment income
Other Income
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	$ (26,463)	$ 34,627	$ 11,198
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Income (loss)	Other Income (loss)	Other Income (loss)
AOCI
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	$ (126,693)	$ 98,731	$ 48,008
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Comprehensive Income (Loss), Net of Tax	Other Comprehensive Income (Loss), Net of Tax	Other Comprehensive Income (Loss), Net of Tax
Derivatives Designated as Hedge Accounting Instruments: | Cash flow hedges | Realized investment gains (losses), net
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	$ (634)	$ 7,637	$ 1,359
Derivatives Designated as Hedge Accounting Instruments: | Cash flow hedges | Market Risk Benefit, Increase (Decrease)
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	0	0	0
Derivatives Designated as Hedge Accounting Instruments: | Cash flow hedges | Investment Income
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	43,816	36,726	16,030
Derivatives Designated as Hedge Accounting Instruments: | Cash flow hedges | Other Income
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	(26,206)	34,070	11,119
Derivatives Designated as Hedge Accounting Instruments: | Cash flow hedges | AOCI
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	(126,693)	98,731	48,008
Derivatives Designated as Hedge Accounting Instruments: | Cash flow hedges | Interest Rate Contract | Realized investment gains (losses), net
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	2	1	2
Derivatives Designated as Hedge Accounting Instruments: | Cash flow hedges | Interest Rate Contract | Market Risk Benefit, Increase (Decrease)
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	0	0	0
Derivatives Designated as Hedge Accounting Instruments: | Cash flow hedges | Interest Rate Contract | Investment Income
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	(118)	(8)	47
Derivatives Designated as Hedge Accounting Instruments: | Cash flow hedges | Interest Rate Contract | Other Income
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	0	0	0
Derivatives Designated as Hedge Accounting Instruments: | Cash flow hedges | Interest Rate Contract | AOCI
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	72	(312)	(161)
Derivatives Designated as Hedge Accounting Instruments: | Cash flow hedges | Currency/Interest Rate | Realized investment gains (losses), net
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	(636)	7,636	1,357
Derivatives Designated as Hedge Accounting Instruments: | Cash flow hedges | Currency/Interest Rate | Market Risk Benefit, Increase (Decrease)
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	0	0	0
Derivatives Designated as Hedge Accounting Instruments: | Cash flow hedges | Currency/Interest Rate | Investment Income
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	43,934	36,734	15,983
Derivatives Designated as Hedge Accounting Instruments: | Cash flow hedges | Currency/Interest Rate | Other Income
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	(26,206)	34,070	11,119
Derivatives Designated as Hedge Accounting Instruments: | Cash flow hedges | Currency/Interest Rate | AOCI
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	(126,765)	99,043	48,169
Derivatives Not Qualifying as Hedge Accounting Instruments: | Realized investment gains (losses), net
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	(1,069,146)	499,676	(383,890)
Derivatives Not Qualifying as Hedge Accounting Instruments: | Market Risk Benefit, Increase (Decrease)
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	(2,377,803)	(4,179,946)	(611,938)
Derivatives Not Qualifying as Hedge Accounting Instruments: | Investment Income
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	0	0	0
Derivatives Not Qualifying as Hedge Accounting Instruments: | Other Income
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	(257)	557	79
Derivatives Not Qualifying as Hedge Accounting Instruments: | AOCI
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	0	0	0
Derivatives Not Qualifying as Hedge Accounting Instruments: | Interest Rate Contract | Realized investment gains (losses), net
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	25,329	661,978	(53,626)
Derivatives Not Qualifying as Hedge Accounting Instruments: | Interest Rate Contract | Market Risk Benefit, Increase (Decrease)
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	(1,555,807)	(5,230,085)	33,029
Derivatives Not Qualifying as Hedge Accounting Instruments: | Interest Rate Contract | Investment Income
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	0	0	0
Derivatives Not Qualifying as Hedge Accounting Instruments: | Interest Rate Contract | Other Income
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	0	0	0
Derivatives Not Qualifying as Hedge Accounting Instruments: | Interest Rate Contract | AOCI
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	0	0	0
Derivatives Not Qualifying as Hedge Accounting Instruments: | Currency | Realized investment gains (losses), net
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	(16,012)	18,952	2,006
Derivatives Not Qualifying as Hedge Accounting Instruments: | Currency | Market Risk Benefit, Increase (Decrease)
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	0	0	0
Derivatives Not Qualifying as Hedge Accounting Instruments: | Currency | Investment Income
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	0	0	0
Derivatives Not Qualifying as Hedge Accounting Instruments: | Currency | Other Income
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	0	0	0
Derivatives Not Qualifying as Hedge Accounting Instruments: | Currency | AOCI
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	0	0	0
Derivatives Not Qualifying as Hedge Accounting Instruments: | Currency/Interest Rate | Realized investment gains (losses), net
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	(102,238)	107,388	44,350
Derivatives Not Qualifying as Hedge Accounting Instruments: | Currency/Interest Rate | Market Risk Benefit, Increase (Decrease)
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	0	0	0
Derivatives Not Qualifying as Hedge Accounting Instruments: | Currency/Interest Rate | Investment Income
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	0	0	0
Derivatives Not Qualifying as Hedge Accounting Instruments: | Currency/Interest Rate | Other Income
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	(257)	557	79
Derivatives Not Qualifying as Hedge Accounting Instruments: | Currency/Interest Rate | AOCI
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	0	0	0
Derivatives Not Qualifying as Hedge Accounting Instruments: | Credit | Realized investment gains (losses), net
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	14,350	(15,904)	2,892
Derivatives Not Qualifying as Hedge Accounting Instruments: | Credit | Market Risk Benefit, Increase (Decrease)
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	0	0	0
Derivatives Not Qualifying as Hedge Accounting Instruments: | Credit | Investment Income
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	0	0	0
Derivatives Not Qualifying as Hedge Accounting Instruments: | Credit | Other Income
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	0	0	0
Derivatives Not Qualifying as Hedge Accounting Instruments: | Credit | AOCI
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	0	0	0
Derivatives Not Qualifying as Hedge Accounting Instruments: | Equity | Realized investment gains (losses), net
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	1,744,218	40,076	(299,798)
Derivatives Not Qualifying as Hedge Accounting Instruments: | Equity | Market Risk Benefit, Increase (Decrease)
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	(821,996)	1,050,139	(644,967)
Derivatives Not Qualifying as Hedge Accounting Instruments: | Equity | Investment Income
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	0	0	0
Derivatives Not Qualifying as Hedge Accounting Instruments: | Equity | Other Income
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	0	0	0
Derivatives Not Qualifying as Hedge Accounting Instruments: | Equity | AOCI
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	0	0	0
Derivatives Not Qualifying as Hedge Accounting Instruments: | Embedded Derivative Financial Instruments | Realized investment gains (losses), net
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	(2,734,793)	(312,814)	(79,714)
Derivatives Not Qualifying as Hedge Accounting Instruments: | Embedded Derivative Financial Instruments | Market Risk Benefit, Increase (Decrease)
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	0	0	0
Derivatives Not Qualifying as Hedge Accounting Instruments: | Embedded Derivative Financial Instruments | Investment Income
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	0	0	0
Derivatives Not Qualifying as Hedge Accounting Instruments: | Embedded Derivative Financial Instruments | Other Income
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	0	0	0
Derivatives Not Qualifying as Hedge Accounting Instruments: | Embedded Derivative Financial Instruments | AOCI
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, gain (loss) on derivative, net	$ 0	$ 0	$ 0