Investments (Credit Quality of Commercial 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
Commercial Mortgage Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	1,573
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,945
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	8,315
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	7,217
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	4,178
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	31,220
Financing Receivable, Revolving	2,251
Mortgage Loans, Gross	$ 57,699	$ 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	$ 1,436
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,145
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	7,503
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	6,696
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	3,880
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	26,446
Financing Receivable, Revolving	2,251
Mortgage Loans, Gross	$ 50,357
Loans Receivable Commercial Mortgage Percentage	87.30%
Commercial Mortgage Loans | 1.00x - 1.20x
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 35
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	531
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	572
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	488
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	139
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	2,751
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 4,516
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	$ 102
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	269
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	240
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	33
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	159
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	2,023
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 2,826
Loans Receivable Commercial Mortgage Percentage	4.90%
Commercial Mortgage Loans | Less than 65%
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 1,481
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,526
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	2,432
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	3,216
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	1,596
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	14,427
Financing Receivable, Revolving	2,251
Mortgage Loans, Gross	$ 27,929
Loans Receivable Commercial Mortgage Percentage	48.40%
Commercial Mortgage Loans | 65% to 75%
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 91
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	361
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	4,400
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	2,497
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	1,341
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	6,142
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 14,832
Loans Receivable Commercial Mortgage Percentage	25.70%
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	15
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	588
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	386
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	293
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	2,745
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 4,027
Loans Receivable Commercial Mortgage Percentage	7.00%
Commercial Mortgage Loans | Greater than 80%
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	43
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	895
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,118
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	948
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	7,906
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 10,911
Loans Receivable Commercial Mortgage Percentage	18.90%