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Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities (Balances of Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Assets Fair Value Disclosure |  |  |
Fixed maturity securities, available-for-sale | $ 56,426 |  | $ 56,735
Equity Method Investments, Fair Value Disclosure | 135 |  | 132
Funds withheld at interest embedded derivatives | 176 |  | 114
Cash and cash equivalents | 1,460 |  | 1,478
Short-term investments | 123 |  | 197
Derivative Assets (Liabilities), at Fair Value, Net | 125 |  | 140
Investments, Fair Value Disclosure | 401 | [1] | 429
Assets, Fair Value Disclosure | 58,721 |  | 59,085
Liabilities Fair Value Disclosure |  |  |
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives | 856 |  | 907
Other liabilities | (53) |  | (49)
Financial Liabilities Fair Value Disclosure | 909 |  | 956
Fair Value, Net Asset (Liability) | 465 |  |
Fair Value Option Contractholder Directed Unit Linked Investments [Member] |  |  |
Assets Fair Value Disclosure |  |  |
Investments, Fair Value Disclosure | 276 |  | 289
Corporate Debt Securities [Member] |  |  |
Assets Fair Value Disclosure |  |  |
Fixed maturity securities, available-for-sale | 35,295 |  | 36,208
Canadian and Canadian provincial governments |  |  |
Assets Fair Value Disclosure |  |  |
Fixed maturity securities, available-for-sale | 4,673 |  | 5,140
Residential mortgage-backed securities |  |  |
Assets Fair Value Disclosure |  |  |
Fixed maturity securities, available-for-sale | 1,591 |  | 1,817
Asset-backed Securities [Member] |  |  |
Assets Fair Value Disclosure |  |  |
Fixed maturity securities, available-for-sale | 3,151 |  | 3,092
Assets, Fair Value Disclosure | 79 |  | 87
Commercial Mortgage Backed Securities [Member] |  |  |
Assets Fair Value Disclosure |  |  |
Fixed maturity securities, available-for-sale | 1,840 |  | 1,868
US Treasury and Government [Member] |  |  |
Assets Fair Value Disclosure |  |  |
Fixed maturity securities, available-for-sale | 930 |  | 1,437
US States and Political Subdivisions Debt Securities [Member] |  |  |
Assets Fair Value Disclosure |  |  |
Fixed maturity securities, available-for-sale | 1,335 |  | 1,390
Debt Security, Government, Non-US [Member] |  |  |
Assets Fair Value Disclosure |  |  |
Fixed maturity securities, available-for-sale | 7,611 |  | 5,783
Fair Value Inputs Level 1 Member |  |  |
Assets Fair Value Disclosure |  |  |
Fixed maturity securities, available-for-sale | 809 |  | 1,312
Equity Method Investments, Fair Value Disclosure | 81 |  | 79
Funds withheld at interest embedded derivatives | 0 |  | 0
Cash and cash equivalents | 1,434 |  | 1,478
Short-term investments | 3 |  | 32
Derivative Assets (Liabilities), at Fair Value, Net | 0 |  | 0
Investments, Fair Value Disclosure | 222 | [1] | 224
Assets, Fair Value Disclosure | 2,549 |  | 3,125
Liabilities Fair Value Disclosure |  |  |
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives | 0 |  | 0
Other liabilities | 0 |  | 0
Financial Liabilities Fair Value Disclosure | 0 |  | 0
Fair Value Inputs Level 1 Member | Fair Value Option Contractholder Directed Unit Linked Investments [Member] |  |  |
Assets Fair Value Disclosure |  |  |
Investments, Fair Value Disclosure | 222 |  | 224
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 [Member] |  |  |
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 Treasury and Government [Member] |  |  |
Assets Fair Value Disclosure |  |  |
Fixed maturity securities, available-for-sale | 809 |  | 1,312
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 | 52,090 |  | 52,100
Equity Method Investments, Fair Value Disclosure | 0 |  | 0
Funds withheld at interest embedded derivatives | 0 |  | 0
Cash and cash equivalents | 26 |  | 0
Short-term investments | 109 |  | 150
Derivative Assets (Liabilities), at Fair Value, Net | 125 |  | 140
Investments, Fair Value Disclosure | 179 | [1] | 205
Assets, Fair Value Disclosure | 52,404 |  | 52,455
Liabilities Fair Value Disclosure |  |  |
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives | 0 |  | 0
Other liabilities | (53) |  | (49)
Financial Liabilities Fair Value Disclosure | 53 |  | 49
Fair Value Inputs Level 2 Member | Fair Value Option Contractholder Directed Unit Linked Investments [Member] |  |  |
Assets Fair Value Disclosure |  |  |
Investments, Fair Value Disclosure | 54 |  | 65
Fair Value Inputs Level 2 Member | Corporate Debt Securities [Member] |  |  |
Assets Fair Value Disclosure |  |  |
Fixed maturity securities, available-for-sale | 32,194 |  | 33,179
Fair Value Inputs Level 2 Member | Canadian and Canadian provincial governments |  |  |
Assets Fair Value Disclosure |  |  |
Fixed maturity securities, available-for-sale | 4,673 |  | 5,140
Fair Value Inputs Level 2 Member | Residential mortgage-backed securities |  |  |
Assets Fair Value Disclosure |  |  |
Fixed maturity securities, available-for-sale | 1,588 |  | 1,814
Fair Value Inputs Level 2 Member | Asset-backed Securities [Member] |  |  |
Assets Fair Value Disclosure |  |  |
Fixed maturity securities, available-for-sale | 2,822 |  | 2,896
Fair Value Inputs Level 2 Member | Commercial Mortgage Backed Securities [Member] |  |  |
Assets Fair Value Disclosure |  |  |
Fixed maturity securities, available-for-sale | 1,784 |  | 1,813
Fair Value Inputs Level 2 Member | US Treasury and Government [Member] |  |  |
Assets Fair Value Disclosure |  |  |
Fixed maturity securities, available-for-sale | 108 |  | 111
Fair Value Inputs Level 2 Member | US States and Political Subdivisions Debt Securities [Member] |  |  |
Assets Fair Value Disclosure |  |  |
Fixed maturity securities, available-for-sale | 1,326 |  | 1,381
Fair Value Inputs Level 2 Member | Debt Security, Government, Non-US [Member] |  |  |
Assets Fair Value Disclosure |  |  |
Fixed maturity securities, available-for-sale | 7,595 |  | 5,766
Fair Value Inputs Level 3 Member |  |  |
Assets Fair Value Disclosure |  |  |
Fixed maturity securities, available-for-sale | 3,527 |  | 3,323
Equity Method Investments, Fair Value Disclosure | 54 |  | 53
Funds withheld at interest embedded derivatives | 176 |  | 114
Cash and cash equivalents | 0 |  | 0
Short-term investments | 11 |  | 15
Derivative Assets (Liabilities), at Fair Value, Net | 0 |  | 0
Investments, Fair Value Disclosure | 0 | [1] | 0
Assets, Fair Value Disclosure | 3,768 |  | 3,505
Liabilities Fair Value Disclosure |  |  |
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives | 856 |  | 907
Other liabilities | 0 |  | 0
Financial Liabilities Fair Value Disclosure | 856 |  | 907
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 | 3,101 |  | 3,029
Fair Value Inputs Level 3 Member | Canadian and Canadian provincial governments |  |  |
Assets Fair Value Disclosure |  |  |
Fixed maturity securities, available-for-sale | 0 |  | 0
Fair Value Inputs Level 3 Member | Residential mortgage-backed securities |  |  |
Assets Fair Value Disclosure |  |  |
Fixed maturity securities, available-for-sale | 3 |  | 3
Fair Value Inputs Level 3 Member | Asset-backed Securities [Member] |  |  |
Assets Fair Value Disclosure |  |  |
Fixed maturity securities, available-for-sale | 329 |  | 196
Fair Value Inputs Level 3 Member | Commercial Mortgage Backed Securities [Member] |  |  |
Assets Fair Value Disclosure |  |  |
Fixed maturity securities, available-for-sale | 56 |  | 55
Fair Value Inputs Level 3 Member | US Treasury and Government [Member] |  |  |
Assets Fair Value Disclosure |  |  |
Fixed maturity securities, available-for-sale | 13 |  | 14
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 | $ 16 |  | $ 17
[1] | Other invested assets included in the fair value hierarchy exclude limited partnership interests that are measured at estimated fair value using the net asset value (“NAV”) per share (or its equivalent) as a practical expedient. As of March 31, 2021, the fair value of such investments was $465 million.

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- 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 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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