Investments (Credit Quality of Agricultural and Residential Mortgage Loans) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Mortgage Loans, Gross	$ 84,290	$ 79,860
Mortgage Loans in Process of Foreclosure, Amount	146	70
Residential Mortgage Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	2,083
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,459
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	384
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,030
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	454
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	7,072
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 12,482	11,196
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	$ 2,071
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,450
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	374
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	982
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	439
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	6,693
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 12,009
Loans Receivable Residential Mortgage Percentage	96.20%
Residential Mortgage Loans | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 12
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	9
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	10
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	48
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	15
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	379
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 473
Loans Receivable Residential Mortgage Percentage	3.80%
Agricultural Mortgage Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 2,771
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	3,028
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	2,976
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,943
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	2,457
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	4,825
Financing Receivable, Revolving	1,306
Mortgage Loans, Gross	$ 19,306	$ 18,111
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	$ 2,594
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,708
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	2,600
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,690
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	2,364
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	4,276
Financing Receivable, Revolving	1,171
Mortgage Loans, Gross	$ 17,403
Loans Receivable Agricultural Mortgage Percentage	90.10%
Agricultural Mortgage Loans | 65% to 75%
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 177
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	320
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	347
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	177
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	93
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	494
Financing Receivable, Revolving	131
Mortgage Loans, Gross	$ 1,739
Loans Receivable Agricultural Mortgage Percentage	9.00%
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	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	11
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 11
Loans Receivable Agricultural Mortgage Percentage	0.10%
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	29
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	76
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	44
Financing Receivable, Revolving	4
Mortgage Loans, Gross	$ 153
Loans Receivable Agricultural Mortgage Percentage	0.80%