Investments (Credit Quality of Commercial Mortgage Loans) (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Financing Receivable, Credit Quality Indicator [Line Items]
Mortgage Loans, Gross	$ 88,889	$ 89,812
Commercial Mortgage Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	319
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	4,244
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	2,897
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	7,205
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	6,519
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	31,515
Financing Receivable, Revolving	2,319
Mortgage Loans, Gross	$ 55,018	$ 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	$ 163
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	3,557
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	2,113
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	6,198
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	5,655
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	26,957
Financing Receivable, Revolving	2,319
Mortgage Loans, Gross	$ 46,962
Loans Receivable Commercial Mortgage Percentage	85.40%
Commercial Mortgage Loans | 1.00x - 1.20x
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	398
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	452
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	386
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	716
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	2,343
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 4,295
Loans Receivable Commercial Mortgage Percentage	7.80%
Commercial Mortgage Loans | Less than 1.00x
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 156
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	289
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	332
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	621
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	148
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	2,215
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 3,761
Loans Receivable Commercial Mortgage Percentage	6.80%
Commercial Mortgage Loans | Less than 65%
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 257
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	3,281
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	2,283
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	2,571
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	3,127
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	13,166
Financing Receivable, Revolving	2,319
Mortgage Loans, Gross	$ 27,004
Loans Receivable Commercial Mortgage Percentage	49.10%
Commercial Mortgage Loans | 65% to 75%
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	788
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	492
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	3,135
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	1,775
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	4,684
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 10,874
Loans Receivable Commercial Mortgage Percentage	19.80%
Commercial Mortgage Loans | 76% to 80%
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 10
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	239
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	226
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	2,826
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 3,305
Loans Receivable Commercial Mortgage Percentage	6.00%
Commercial Mortgage Loans | Greater than 80%
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 52
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	175
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	118
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,260
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	1,391
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	10,839
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 13,835
Loans Receivable Commercial Mortgage Percentage	25.10%