Investments (Credit Quality of Commercial Mortgage Loans) (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Mortgage Loans, Gross	$ 82,408	$ 79,860
Commercial Mortgage Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	5,137
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	7,042
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	4,815
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	7,996
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	7,090
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	17,671
Financing Receivable, Revolving	2,597
Mortgage Loans, Gross	$ 52,348	$ 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	$ 5,016
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	6,349
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	4,610
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	7,592
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	6,535
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	15,498
Financing Receivable, Revolving	2,242
Mortgage Loans, Gross	$ 47,842
Loans Receivable Commercial Mortgage Percentage	91.40%
Commercial Mortgage Loans | 1.00x - 1.20x
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 92
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	272
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	18
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	223
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	340
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 945
Loans Receivable Commercial Mortgage Percentage	1.80%
Commercial Mortgage Loans | Less than 1.00x
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 29
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	421
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	187
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	404
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	332
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,833
Financing Receivable, Revolving	355
Mortgage Loans, Gross	$ 3,561
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	$ 4,139
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	5,557
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	4,006
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	5,352
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	5,462
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	14,552
Financing Receivable, Revolving	2,597
Mortgage Loans, Gross	$ 41,665
Loans Receivable Commercial Mortgage Percentage	79.60%
Commercial Mortgage Loans | 65% to 75%
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 937
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,483
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	777
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	2,230
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	1,349
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,631
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 8,407
Loans Receivable Commercial Mortgage Percentage	16.00%
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	2
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	32
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	410
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	200
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	291
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 935
Loans Receivable Commercial Mortgage Percentage	1.80%
Commercial Mortgage Loans | Greater than 80%
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 61
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	4
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	79
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,197
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 1,341
Loans Receivable Commercial Mortgage Percentage	2.60%