Investments (Credit Quality of Agricultural and Residential Mortgage Loans) (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Mortgage Loans, Gross	$ 82,408	$ 79,860
Mortgage Loans in Process of Foreclosure, Amount	137	70
Residential Mortgage Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	911
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,276
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	393
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,086
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	481
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	7,350
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 11,497	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	$ 909
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,270
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	386
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,039
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	465
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	6,957
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 11,026
Loans Receivable Residential Mortgage Percentage	95.90%
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	6
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	7
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	47
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	16
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	393
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 471
Loans Receivable Residential Mortgage Percentage	4.10%
Agricultural Mortgage Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 1,934
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,907
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	3,019
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,987
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	2,502
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	5,092
Financing Receivable, Revolving	1,122
Mortgage Loans, Gross	$ 18,563	$ 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	$ 1,794
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,586
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	2,633
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,726
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	2,402
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	4,534
Financing Receivable, Revolving	1,061
Mortgage Loans, Gross	$ 16,736
Loans Receivable Agricultural Mortgage Percentage	90.20%
Agricultural Mortgage Loans | 65% to 75%
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 140
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	321
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	356
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	185
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	100
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	503
Financing Receivable, Revolving	55
Mortgage Loans, Gross	$ 1,660
Loans Receivable Agricultural Mortgage Percentage	8.90%
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	30
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	6
Mortgage Loans, Gross	$ 156
Loans Receivable Agricultural Mortgage Percentage	0.80%