Investments (Credit Quality of Agricultural and Residential Mortgage Loans) (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Mortgage Loans, Gross	$ 90,608	$ 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	242
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	966
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	2,560
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,637
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	337
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	7,531
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 13,273	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	$ 241
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	944
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	2,493
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,612
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	324
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	7,252
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 12,866
Loans Receivable Residential Mortgage Percentage	96.90%
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	22
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	67
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	25
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	13
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	279
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 407
Loans Receivable Residential Mortgage Percentage	3.10%
Agricultural Mortgage Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 350
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,203
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	2,870
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	2,947
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	2,805
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	7,889
Financing Receivable, Revolving	1,572
Mortgage Loans, Gross	$ 19,636	$ 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	$ 342
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,152
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	2,783
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	2,639
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	2,626
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	7,263
Financing Receivable, Revolving	1,424
Mortgage Loans, Gross	$ 18,229
Loans Receivable Agricultural Mortgage Percentage	92.90%
Agricultural Mortgage Loans | 65% to 75%
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 8
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	51
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	87
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	294
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	147
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	547
Financing Receivable, Revolving	129
Mortgage Loans, Gross	$ 1,263
Loans Receivable Agricultural Mortgage Percentage	6.40%
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	0
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 0
Loans Receivable Agricultural Mortgage Percentage	0.00%
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	14
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	32
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	79
Financing Receivable, Revolving	19
Mortgage Loans, Gross	$ 144
Loans Receivable Agricultural Mortgage Percentage	0.70%