Investments (Credit Quality of Agricultural and Residential Mortgage Loans) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Mortgage Loans, Gross	$ 89,812	$ 93,227
Mortgage Loans in Process of Foreclosure, Amount	140	140
Residential Mortgage Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	1,413
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	926
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	2,500
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,838
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	330
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	7,182
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 14,189	13,096
Loans Receivable Residential Mortgage Percentage	100.00%
Residential Mortgage Loans | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 1,398
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	881
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	2,414
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,809
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	313
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	6,910
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 13,725
Loans Receivable Residential Mortgage Percentage	96.70%
Residential Mortgage Loans | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 15
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	45
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	86
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	29
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	17
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	272
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 464
Loans Receivable Residential Mortgage Percentage	3.30%
Agricultural Mortgage Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 750
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,262
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	2,813
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	2,890
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	2,618
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	7,500
Financing Receivable, Revolving	1,480
Mortgage Loans, Gross	$ 19,313	$ 19,805
Loans Receivable Agricultural Mortgage Percentage	100.00%
Agricultural Mortgage Loans | Less than 65%
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 703
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,202
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	2,557
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	2,569
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	2,486
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	6,938
Financing Receivable, Revolving	1,448
Mortgage Loans, Gross	$ 17,903
Loans Receivable Agricultural Mortgage Percentage	92.70%
Agricultural Mortgage Loans | 65% to 75%
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 47
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	60
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	232
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	321
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	113
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	511
Financing Receivable, Revolving	22
Mortgage Loans, Gross	$ 1,306
Loans Receivable Agricultural Mortgage Percentage	6.80%
Agricultural Mortgage Loans | 76% to 80%
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	24
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	5
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0
Financing Receivable, Revolving	9
Mortgage Loans, Gross	$ 38
Loans Receivable Agricultural Mortgage Percentage	0.20%
Agricultural Mortgage Loans | Greater than 80%
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	14
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	51
Financing Receivable, Revolving	1
Mortgage Loans, Gross	$ 66
Loans Receivable Agricultural Mortgage Percentage	0.30%