Investments (Credit Quality of Commercial Mortgage Loans) (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Mortgage Loans, Gross	$ 93,710	$ 84,290
Commercial Mortgage Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	1,583
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	8,756
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	7,572
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	5,034
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	8,706
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	26,181
Financing Receivable, Revolving	2,927
Mortgage Loans, Gross	$ 60,759	$ 52,502
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	$ 1,070
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	7,366
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	7,192
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	4,471
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	7,252
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	22,802
Financing Receivable, Revolving	1,687
Mortgage Loans, Gross	$ 51,840
Loans Receivable Commercial Mortgage Percentage	85.30%
Commercial Mortgage Loans | 1.00x - 1.20x
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 513
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	387
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	307
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	35
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	723
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,858
Financing Receivable, Revolving	944
Mortgage Loans, Gross	$ 4,767
Loans Receivable Commercial Mortgage Percentage	7.90%
Commercial Mortgage Loans | Less than 1.00x
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	1,003
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	73
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	528
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	731
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,521
Financing Receivable, Revolving	296
Mortgage Loans, Gross	$ 4,152
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	$ 1,448
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	5,123
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	4,652
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	2,110
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	4,294
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	14,278
Financing Receivable, Revolving	2,927
Mortgage Loans, Gross	$ 34,832
Loans Receivable Commercial Mortgage Percentage	57.30%
Commercial Mortgage Loans | 65% to 75%
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 128
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,728
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	1,749
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,703
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	2,022
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	6,311
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 14,641
Loans Receivable Commercial Mortgage Percentage	24.10%
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	761
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	351
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	340
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	1,339
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,859
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 4,650
Loans Receivable Commercial Mortgage Percentage	7.70%
Commercial Mortgage Loans | Greater than 80%
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 7
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	144
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	820
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	881
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	1,051
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	3,733
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 6,636
Loans Receivable Commercial Mortgage Percentage	10.90%