Investments (Credit Quality of Agricultural and Residential Mortgage Loans) (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Financing Receivable, Credit Quality Indicator [Line Items]
Mortgage Loans, Gross	$ 88,064	$ 89,812
Mortgage Loans in Process of Foreclosure, Amount	179	140
Residential Mortgage Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	507
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,440
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	896
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	2,397
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	1,785
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	7,261
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 15,286	14,189
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	$ 505
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,405
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	847
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	2,299
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	1,749
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	6,984
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 14,789
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	$ 2
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	35
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	49
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	98
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	36
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	277
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 497
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	$ 633
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	777
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	1,279
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	2,740
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	2,744
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	9,713
Financing Receivable, Revolving	1,437
Mortgage Loans, Gross	$ 19,323	$ 19,313
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	$ 628
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	769
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	1,228
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	2,489
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	2,428
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	9,020
Financing Receivable, Revolving	1,353
Mortgage Loans, Gross	$ 17,915
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	$ 5
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	8
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	51
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	227
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	316
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	620
Financing Receivable, Revolving	79
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	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	24
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	9
Financing Receivable, Revolving	4
Mortgage Loans, Gross	$ 37
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	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	64
Financing Receivable, Revolving	1
Mortgage Loans, Gross	$ 65
Loans Receivable Agricultural Mortgage Percentage	0.30%