Investments (Credit Quality of Commercial Mortgage Loans) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Mortgage Loans, Gross	$ 84,290	$ 79,860
Commercial Mortgage Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	7,499
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	6,919
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	4,686
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	7,696
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	6,667
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	16,175
Financing Receivable, Revolving	2,860
Mortgage Loans, Gross	$ 52,502	$ 50,553
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	$ 6,705
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	6,410
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	4,441
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	7,123
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	5,981
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	14,107
Financing Receivable, Revolving	2,860
Mortgage Loans, Gross	$ 47,627
Loans Receivable Commercial Mortgage Percentage	90.70%
Commercial Mortgage Loans | 1.00x - 1.20x
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 667
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	128
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	115
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	436
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	274
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	963
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 2,583
Loans Receivable Commercial Mortgage Percentage	4.90%
Commercial Mortgage Loans | Less than 1.00x
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	381
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	130
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	137
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	412
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,105
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 2,292
Loans Receivable Commercial Mortgage Percentage	4.40%
Commercial Mortgage Loans | Less than 65%
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 5,081
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	5,633
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	3,496
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	5,195
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	4,866
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	13,237
Financing Receivable, Revolving	2,860
Mortgage Loans, Gross	$ 40,368
Loans Receivable Commercial Mortgage Percentage	76.90%
Commercial Mortgage Loans | 65% to 75%
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 2,321
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,227
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	1,073
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,613
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	1,360
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,872
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 9,466
Loans Receivable Commercial Mortgage Percentage	18.00%
Commercial Mortgage Loans | 76% to 80%
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 64
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	19
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	99
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	467
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	290
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	287
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 1,226
Loans Receivable Commercial Mortgage Percentage	2.30%
Commercial Mortgage Loans | Greater than 80%
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 33
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	40
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	18
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	421
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	151
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	779
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 1,442
Loans Receivable Commercial Mortgage Percentage	2.80%