Investments (Credit Quality of Commercial 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
Commercial Mortgage Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	1,715
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	4,225
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	2,920
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	6,488
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	6,321
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	29,568
Financing Receivable, Revolving	2,218
Mortgage Loans, Gross	$ 53,455	$ 56,310
Loans Receivable Commercial Mortgage Percentage	100.00%
Commercial Mortgage Loans | Greater than 1.20x
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 1,384
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	3,457
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	2,141
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	5,546
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	5,029
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	23,903
Financing Receivable, Revolving	2,218
Mortgage Loans, Gross	$ 43,678
Loans Receivable Commercial Mortgage Percentage	81.70%
Commercial Mortgage Loans | 1.00x - 1.20x
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 136
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	475
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	493
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	471
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	932
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	3,054
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 5,561
Loans Receivable Commercial Mortgage Percentage	10.40%
Commercial Mortgage Loans | Less than 1.00x
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 195
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	293
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	286
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	471
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	360
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	2,611
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 4,216
Loans Receivable Commercial Mortgage Percentage	7.90%
Commercial Mortgage Loans | Less than 65%
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 1,398
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	3,257
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	2,301
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	2,147
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	3,020
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	12,231
Financing Receivable, Revolving	2,218
Mortgage Loans, Gross	$ 26,572
Loans Receivable Commercial Mortgage Percentage	49.70%
Commercial Mortgage Loans | 65% to 75%
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 130
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	790
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	496
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	2,908
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	1,837
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	4,292
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 10,453
Loans Receivable Commercial Mortgage Percentage	19.60%
Commercial 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	4
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	173
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	175
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	2,636
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 2,988
Loans Receivable Commercial Mortgage Percentage	5.60%
Commercial Mortgage Loans | Greater than 80%
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 187
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	178
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	119
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,260
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	1,289
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	10,409
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 13,442
Loans Receivable Commercial Mortgage Percentage	25.10%