Investments (Credit Quality of Commercial Mortgage Loans) (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Mortgage Loans, Gross	$ 82,904	$ 79,860
Commercial Mortgage Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	6,594
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	6,918
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	4,638
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	7,680
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	6,883
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	16,804
Financing Receivable, Revolving	2,756
Mortgage Loans, Gross	$ 52,273	$ 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	$ 6,239
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	6,176
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	4,414
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	7,354
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	6,148
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	14,591
Financing Receivable, Revolving	2,756
Mortgage Loans, Gross	$ 47,678
Loans Receivable Commercial Mortgage Percentage	91.20%
Commercial Mortgage Loans | 1.00x - 1.20x
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 286
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	366
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	18
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	50
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	275
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	950
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 1,945
Loans Receivable Commercial Mortgage Percentage	3.70%
Commercial Mortgage Loans | Less than 1.00x
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 69
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	376
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	206
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	276
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	460
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,263
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 2,650
Loans Receivable Commercial Mortgage Percentage	5.10%
Commercial Mortgage Loans | Less than 65%
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 4,602
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	5,684
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	3,677
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	5,588
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	5,167
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	13,630
Financing Receivable, Revolving	2,756
Mortgage Loans, Gross	$ 41,104
Loans Receivable Commercial Mortgage Percentage	78.60%
Commercial Mortgage Loans | 65% to 75%
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 1,831
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,188
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	929
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,389
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	1,340
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,767
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 8,444
Loans Receivable Commercial Mortgage Percentage	16.20%
Commercial Mortgage Loans | 76% to 80%
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 17
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	7
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	32
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	559
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	225
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	211
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 1,051
Loans Receivable Commercial Mortgage Percentage	2.00%
Commercial Mortgage Loans | Greater than 80%
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 144
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	39
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	144
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	151
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,196
Financing Receivable, Revolving	0
Mortgage Loans, Gross	$ 1,674
Loans Receivable Commercial Mortgage Percentage	3.20%