Investments - Commercial and Residential Mortgage Loans, Percentage by Geographical Location (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]
Net Carrying Value	$ 191,801	$ 11,354
Commercial Loan
Financing Receivable, Allowance for Credit Loss [Line Items]
Net Carrying Value	$ 19,339
Percentage of Total	100.00%
Residential Mortgage
Financing Receivable, Allowance for Credit Loss [Line Items]
Percentage of Total	100.00%
East North Central | Commercial Loan
Financing Receivable, Allowance for Credit Loss [Line Items]
Net Carrying Value	$ 1,658
Percentage of Total	8.60%
East South Central | Commercial Loan
Financing Receivable, Allowance for Credit Loss [Line Items]
Net Carrying Value	$ 447
Percentage of Total	2.30%
Middle Atlantic | Commercial Loan
Financing Receivable, Allowance for Credit Loss [Line Items]
Net Carrying Value	$ 4,118
Percentage of Total	21.30%
Mountain | Commercial Loan
Financing Receivable, Allowance for Credit Loss [Line Items]
Net Carrying Value	$ 935
Percentage of Total	4.80%
New England | Commercial Loan
Financing Receivable, Allowance for Credit Loss [Line Items]
Net Carrying Value	$ 1,118
Percentage of Total	5.80%
Pacific | Commercial Loan
Financing Receivable, Allowance for Credit Loss [Line Items]
Net Carrying Value	$ 4,060
Percentage of Total	21.00%
South Atlantic | Commercial Loan
Financing Receivable, Allowance for Credit Loss [Line Items]
Net Carrying Value	$ 2,886
Percentage of Total	14.90%
West North Central | Commercial Loan
Financing Receivable, Allowance for Credit Loss [Line Items]
Net Carrying Value	$ 273
Percentage of Total	1.40%
West South Central | Commercial Loan
Financing Receivable, Allowance for Credit Loss [Line Items]
Net Carrying Value	$ 1,203
Percentage of Total	6.20%
Total US residential mortgage loan percentage | Commercial Loan
Financing Receivable, Allowance for Credit Loss [Line Items]
Net Carrying Value	$ 16,698
Percentage of Total	86.30%
Total US residential mortgage loan percentage | Residential Mortgage
Financing Receivable, Allowance for Credit Loss [Line Items]
Percentage of Total	86.50%
United Kingdom | Commercial Loan
Financing Receivable, Allowance for Credit Loss [Line Items]
Net Carrying Value	$ 1,703
Percentage of Total	8.80%
United Kingdom | Residential Mortgage
Financing Receivable, Allowance for Credit Loss [Line Items]
Percentage of Total	5.10%
Ireland | Residential Mortgage
Financing Receivable, Allowance for Credit Loss [Line Items]
Percentage of Total	4.10%
International Other | Commercial Loan
Financing Receivable, Allowance for Credit Loss [Line Items]
Net Carrying Value	$ 938
Percentage of Total	4.90%
International Other | Residential Mortgage
Financing Receivable, Allowance for Credit Loss [Line Items]
Percentage of Total	4.30%
Total International Region | Commercial Loan
Financing Receivable, Allowance for Credit Loss [Line Items]
Net Carrying Value	$ 2,641
Percentage of Total	13.70%
Total International Region | Residential Mortgage
Financing Receivable, Allowance for Credit Loss [Line Items]
Percentage of Total	13.50%
California | Residential Mortgage
Financing Receivable, Allowance for Credit Loss [Line Items]
Percentage of Total	31.60%
Florida | Residential Mortgage
Financing Receivable, Allowance for Credit Loss [Line Items]
Percentage of Total	10.00%
New Jersey | Residential Mortgage
Financing Receivable, Allowance for Credit Loss [Line Items]
Percentage of Total	5.10%
Other | Residential Mortgage
Financing Receivable, Allowance for Credit Loss [Line Items]
Percentage of Total	39.80%
Office building | Commercial Loan
Financing Receivable, Allowance for Credit Loss [Line Items]
Net Carrying Value	$ 5,148
Percentage of Total	26.60%
Retail | Commercial Loan
Financing Receivable, Allowance for Credit Loss [Line Items]
Net Carrying Value	$ 1,929
Percentage of Total	10.00%
Apartment | Commercial Loan
Financing Receivable, Allowance for Credit Loss [Line Items]
Net Carrying Value	$ 6,068
Percentage of Total	31.40%
Hotels | Commercial Loan
Financing Receivable, Allowance for Credit Loss [Line Items]
Net Carrying Value	$ 1,730
Percentage of Total	8.90%
Industrial | Commercial Loan
Financing Receivable, Allowance for Credit Loss [Line Items]
Net Carrying Value	$ 2,459
Percentage of Total	12.70%
Other commercial | Commercial Loan
Financing Receivable, Allowance for Credit Loss [Line Items]
Net Carrying Value	$ 2,005
Percentage of Total	10.40%