Investments (Credit Quality of Agricultural and Residential Mortgage Loans) (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Mortgage Loans, Gross	$ 93,710	$ 84,290
Mortgage Loans in Process of Foreclosure, Amount	153	146
Residential Mortgage Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	364
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,646
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	1,496
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	361
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	1,017
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	7,245
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 13,129	12,482
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	$ 363
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,622
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	1,479
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	347
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	975
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	6,908
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 12,694
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	$ 1
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	24
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	17
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	14
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	42
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	337
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 435
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	$ 771
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,912
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	2,987
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	2,978
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	1,936
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	6,872
Financing Receivable, Revolving	1,366
Mortgage Loans, Gross	$ 19,822	$ 19,306
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	$ 726
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,801
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	2,653
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	2,705
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	1,775
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	6,193
Financing Receivable, Revolving	1,226
Mortgage Loans, Gross	$ 18,079
Loans Receivable Agricultural Mortgage Percentage	91.20%
Agricultural Mortgage Loans | 65% to 75%
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 28
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	111
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	334
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	273
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	28
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	616
Financing Receivable, Revolving	135
Mortgage Loans, Gross	$ 1,525
Loans Receivable Agricultural Mortgage Percentage	7.70%
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	$ 17
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	133
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	52
Financing Receivable, Revolving	5
Mortgage Loans, Gross	$ 207
Loans Receivable Agricultural Mortgage Percentage	1.00%