Investments (Credit Quality of Commercial Mortgage Loans) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Mortgage Loans, Gross	$ 89,812	$ 93,227
Commercial Mortgage Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	4,215
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,883
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	7,941
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	6,750
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	3,484
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	28,597
Financing Receivable, Revolving	2,440
Mortgage Loans, Gross	$ 56,310	$ 60,326
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	$ 3,284
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,960
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	6,841
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	6,018
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	3,256
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	24,755
Financing Receivable, Revolving	2,440
Mortgage Loans, Gross	$ 48,554
Loans Receivable Commercial Mortgage Percentage	86.20%
Commercial Mortgage Loans | 1.00x - 1.20x
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 438
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	591
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	540
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	633
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	190
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,949
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 4,341
Loans Receivable Commercial Mortgage Percentage	7.70%
Commercial Mortgage Loans | Less than 1.00x
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 493
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	332
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	560
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	99
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	38
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,893
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 3,415
Loans Receivable Commercial Mortgage Percentage	6.10%
Commercial Mortgage Loans | Less than 65%
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 3,094
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,276
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	2,675
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	3,102
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	1,193
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	12,422
Financing Receivable, Revolving	2,440
Mortgage Loans, Gross	$ 27,202
Loans Receivable Commercial Mortgage Percentage	48.30%
Commercial Mortgage Loans | 65% to 75%
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 788
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	487
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	3,714
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,789
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	306
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	4,473
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 11,557
Loans Receivable Commercial Mortgage Percentage	20.50%
Commercial Mortgage Loans | 76% to 80%
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 206
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	4
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	250
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	347
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	427
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	2,304
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 3,538
Loans Receivable Commercial Mortgage Percentage	6.30%
Commercial Mortgage Loans | Greater than 80%
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 127
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	116
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	1,302
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,512
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	1,558
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	9,398
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 14,013
Loans Receivable Commercial Mortgage Percentage	24.90%