Investments (Credit Quality of Commercial Mortgage Loans) (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Mortgage Loans, Gross	$ 91,262	$ 93,227
Commercial Mortgage Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	2,508
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,992
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	8,410
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	7,134
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	3,899
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	30,608
Financing Receivable, Revolving	2,398
Mortgage Loans, Gross	$ 57,949	$ 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	$ 2,284
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,983
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	7,448
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	6,496
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	3,715
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	25,911
Financing Receivable, Revolving	2,398
Mortgage Loans, Gross	$ 50,235
Loans Receivable Commercial Mortgage Percentage	86.70%
Commercial Mortgage Loans | 1.00x - 1.20x
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 148
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	603
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	711
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	490
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	105
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	2,485
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 4,542
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	$ 76
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	406
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	251
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	148
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	79
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	2,212
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 3,172
Loans Receivable Commercial Mortgage Percentage	5.50%
Commercial Mortgage Loans | Less than 65%
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 2,007
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,545
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	2,668
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	3,168
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	1,495
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	13,882
Financing Receivable, Revolving	2,398
Mortgage Loans, Gross	$ 28,163
Loans Receivable Commercial Mortgage Percentage	48.60%
Commercial Mortgage Loans | 65% to 75%
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 462
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	374
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	4,012
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	2,267
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	297
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	4,230
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 11,642
Loans Receivable Commercial Mortgage Percentage	20.10%
Commercial Mortgage Loans | 76% to 80%
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 2
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	16
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	611
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	287
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	428
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	2,789
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 4,133
Loans Receivable Commercial Mortgage Percentage	7.10%
Commercial Mortgage Loans | Greater than 80%
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 37
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	57
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	1,119
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,412
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	1,679
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	9,707
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 14,011
Loans Receivable Commercial Mortgage Percentage	24.20%