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Fair Value of Assets and Liabilities (Balances of Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | $ 54,652 | $ 51,121
Equity Method Investments, Fair Value Disclosure | 135 | 320
Funds withheld at interest embedded derivatives | 7 | 121
Cash and cash equivalents | 1,835 | 274
Short-term investments | 101 | 32
Derivative Assets (Liabilities), at Fair Value, Net |  | 117
Investments, Fair Value Disclosure | 436 | 377
Assets, Fair Value Disclosure | 57,166 | 52,245
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives | 980 | 930
Liabilities Fair Value Disclosure |  |
Other liabilities |  | (53)
Financial Liabilities Fair Value Disclosure | 1,038 | 983
Other |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 4 | 0
Interest Rate Swap [Member] |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 174 |
Liabilities Fair Value Disclosure |  |
Other liabilities | (58) |
Fair Value Option Contractholder Directed Unit Linked Investments [Member] |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 258 | 260
Corporate Debt Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 34,259 | 31,393
Canadian and Canadian provincial governments |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 4,897 | 4,612
Residential mortgage-backed securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 2,027 | 2,398
Asset-backed securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 2,922 | 2,978
Assets, Fair Value Disclosure | 80 | 101
Commercial Mortgage Backed Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 1,930 | 1,899
US Government Agencies Debt Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 1,630 | 2,152
Assets, Fair Value Disclosure | 15 | 16
US States and Political Subdivisions Debt Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 1,383 | 1,164
Debt Security, Government, Non-US [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 5,604 | 4,525
Fair Value Inputs Level 1 Member |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 1,520 | 2,030
Equity Method Investments, Fair Value Disclosure | 75 | 243
Funds withheld at interest embedded derivatives | 0 | 0
Cash and cash equivalents | 1,825 | 274
Short-term investments | 20 | 4
Derivative Assets (Liabilities), at Fair Value, Net |  | 0
Investments, Fair Value Disclosure | 201 | 207
Assets, Fair Value Disclosure | 3,641 | 2,758
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives | 0 | 0
Liabilities Fair Value Disclosure |  |
Other liabilities |  | 0
Financial Liabilities Fair Value Disclosure | 0 | 0
Fair Value Inputs Level 1 Member | Other |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 0 | 0
Fair Value Inputs Level 1 Member | Interest Rate Swap [Member] |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 0 |
Liabilities Fair Value Disclosure |  |
Other liabilities | 0 |
Fair Value Inputs Level 1 Member | Fair Value Option Contractholder Directed Unit Linked Investments [Member] |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 201 | 207
Fair Value Inputs Level 1 Member | Corporate Debt Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 0 | 0
Fair Value Inputs Level 1 Member | Canadian and Canadian provincial governments |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 0 | 0
Fair Value Inputs Level 1 Member | Residential mortgage-backed securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 0 | 0
Fair Value Inputs Level 1 Member | Asset-backed securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 0 | 0
Fair Value Inputs Level 1 Member | Commercial Mortgage Backed Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 0 | 0
Fair Value Inputs Level 1 Member | US Government Agencies Debt Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 1,520 | 2,030
Fair Value Inputs Level 1 Member | US States and Political Subdivisions Debt Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 0 | 0
Fair Value Inputs Level 1 Member | Debt Security, Government, Non-US [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 0 | 0
Fair Value Inputs Level 2 Member |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 50,358 | 45,952
Equity Method Investments, Fair Value Disclosure | 0 | 0
Funds withheld at interest embedded derivatives | 0 | 0
Cash and cash equivalents | 10 | 0
Short-term investments | 75 | 26
Derivative Assets (Liabilities), at Fair Value, Net |  | 117
Investments, Fair Value Disclosure | 235 | 170
Assets, Fair Value Disclosure | 50,678 | 46,148
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives | 0 | 0
Liabilities Fair Value Disclosure |  |
Other liabilities |  | (53)
Financial Liabilities Fair Value Disclosure | 58 | 53
Fair Value Inputs Level 2 Member | Other |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 4 | 0
Fair Value Inputs Level 2 Member | Interest Rate Swap [Member] |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 174 |
Liabilities Fair Value Disclosure |  |
Other liabilities | (58) |
Fair Value Inputs Level 2 Member | Fair Value Option Contractholder Directed Unit Linked Investments [Member] |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 57 | 53
Fair Value Inputs Level 2 Member | Corporate Debt Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 31,732 | 29,207
Fair Value Inputs Level 2 Member | Canadian and Canadian provincial governments |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 4,897 | 3,908
Fair Value Inputs Level 2 Member | Residential mortgage-backed securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 2,023 | 2,349
Fair Value Inputs Level 2 Member | Asset-backed securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 2,772 | 2,865
Fair Value Inputs Level 2 Member | Commercial Mortgage Backed Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 1,878 | 1,853
Fair Value Inputs Level 2 Member | US Government Agencies Debt Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 95 | 106
Fair Value Inputs Level 2 Member | US States and Political Subdivisions Debt Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 1,374 | 1,155
Fair Value Inputs Level 2 Member | Debt Security, Government, Non-US [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 5,587 | 4,509
Fair Value Inputs Level 3 Member |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 2,774 | 3,139
Equity Method Investments, Fair Value Disclosure | 60 | 77
Funds withheld at interest embedded derivatives | 7 | 121
Cash and cash equivalents | 0 | 0
Short-term investments | 6 | 2
Derivative Assets (Liabilities), at Fair Value, Net |  | 0
Investments, Fair Value Disclosure | 0 | 0
Assets, Fair Value Disclosure | 2,847 | 3,339
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives | 980 | 930
Liabilities Fair Value Disclosure |  |
Other liabilities |  | 0
Financial Liabilities Fair Value Disclosure | 980 | 930
Fair Value Inputs Level 3 Member | Other |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 0 | 0
Fair Value Inputs Level 3 Member | Interest Rate Swap [Member] |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 0 |
Liabilities Fair Value Disclosure |  |
Other liabilities | 0 |
Fair Value Inputs Level 3 Member | Fair Value Option Contractholder Directed Unit Linked Investments [Member] |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 0 | 0
Fair Value Inputs Level 3 Member | Corporate Debt Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 2,527 | 2,186
Fair Value Inputs Level 3 Member | Canadian and Canadian provincial governments |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 0 | 704
Fair Value Inputs Level 3 Member | Residential mortgage-backed securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 4 | 49
Fair Value Inputs Level 3 Member | Asset-backed securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 150 | 113
Fair Value Inputs Level 3 Member | Commercial Mortgage Backed Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 52 | 46
Fair Value Inputs Level 3 Member | US Government Agencies Debt Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 15 | 16
Fair Value Inputs Level 3 Member | US States and Political Subdivisions Debt Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 9 | 9
Fair Value Inputs Level 3 Member | Debt Security, Government, Non-US [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | $ 17 | $ 16

X
- Definition Embedded derivatives related to funds held by the ceding insurer on behalf the reinsurer, including funds held in trust, under reinsurance treaties or contracts with the assuming insurer as security for the payment of the obligations thereunder, which represent an asset for the reinsurer. There is another concept for the corresponding liability of the ceding insurer. + References No definition available. + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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- Definition Fair value portion of investments accounted under the equity method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=117311354&loc=d3e32014-111567 + Details
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- Definition Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities. + References No definition available. + Details
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