Fair Value of Financial Instruments - Carrying Amounts of Assets and Liabilities at Estimated Fair Value Measured on a Recurring Basis (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 |
Assets, Fair Value Disclosure [Abstract] | | |
Fixed maturity securities, available for sale | $ 27,587 | $ 2,090 |
Derivative investments | 548 | 0 |
Total financial assets at fair value | 3,267 | |
Derivatives: | | |
Trade and notes receivables, net of allowance of $28 and $20 at December 31, 2020 and December 31, 2019, respectively | 437 | 346 |
Level 1 | | |
Assets, Fair Value Disclosure [Abstract] | | |
Cash and cash equivalents | 2,719 | 1,376 |
Equity securities | | 810 |
Derivative investments | 0 | |
Short term investments | 769 | 876 |
Total financial assets at fair value | 5,311 | 3,127 |
Liabilities, Fair Value Disclosure [Abstract] | | |
Fair value of future policy benefits | 0 | |
Derivatives: | | |
Total financial liabilities at fair value | 0 | |
Trade and notes receivables, net of allowance of $28 and $20 at December 31, 2020 and December 31, 2019, respectively | 0 | |
Level 2 | | |
Assets, Fair Value Disclosure [Abstract] | | |
Cash and cash equivalents | 0 | 0 |
Equity securities | | 0 |
Derivative investments | 548 | |
Short term investments | 0 | 0 |
Total financial assets at fair value | 25,431 | 2,331 |
Liabilities, Fair Value Disclosure [Abstract] | | |
Fair value of future policy benefits | 0 | |
Derivatives: | | |
Total financial liabilities at fair value | 101 | |
Trade and notes receivables, net of allowance of $28 and $20 at December 31, 2020 and December 31, 2019, respectively | 0 | |
Level 3 | | |
Assets, Fair Value Disclosure [Abstract] | | |
Cash and cash equivalents | 0 | 0 |
Equity securities | | 1 |
Derivative investments | 0 | |
Short term investments | 0 | 0 |
Total financial assets at fair value | 3,267 | 138 |
Liabilities, Fair Value Disclosure [Abstract] | | |
Fair value of future policy benefits | 5 | |
Derivatives: | | |
Total financial liabilities at fair value | 3,409 | |
Trade and notes receivables, net of allowance of $28 and $20 at December 31, 2020 and December 31, 2019, respectively | 437 | |
Fair Value | | |
Assets, Fair Value Disclosure [Abstract] | | |
Cash and cash equivalents | 2,719 | 1,376 |
Equity securities | | 811 |
Derivative investments | 548 | |
Short term investments | 769 | 876 |
Total financial assets at fair value | 34,009 | 5,596 |
Liabilities, Fair Value Disclosure [Abstract] | | |
Fair value of future policy benefits | 5 | |
Derivatives: | | |
Total financial liabilities at fair value | 3,510 | |
Trade and notes receivables, net of allowance of $28 and $20 at December 31, 2020 and December 31, 2019, respectively | 437 | |
Carrying Value | | |
Assets, Fair Value Disclosure [Abstract] | | |
Cash and cash equivalents | 2,719 | 1,376 |
Equity securities | | 811 |
Derivative investments | 548 | |
Short term investments | 769 | 876 |
Total financial assets at fair value | 34,009 | 5,596 |
Liabilities, Fair Value Disclosure [Abstract] | | |
Fair value of future policy benefits | 5 | |
Derivatives: | | |
Total financial liabilities at fair value | 3,510 | |
Trade and notes receivables, net of allowance of $28 and $20 at December 31, 2020 and December 31, 2019, respectively | 437 | |
FIA embedded derivatives, included in contractholder funds | Level 1 | | |
Derivatives: | | |
Derivative liability | 0 | |
FIA embedded derivatives, included in contractholder funds | Level 2 | | |
Derivatives: | | |
Derivative liability | 0 | |
FIA embedded derivatives, included in contractholder funds | Level 3 | | |
Derivatives: | | |
Derivative liability | 3,404 | |
FIA embedded derivatives, included in contractholder funds | Fair Value | | |
Derivatives: | | |
Derivative liability | 3,404 | |
FIA embedded derivatives, included in contractholder funds | Carrying Value | | |
Derivatives: | | |
Derivative liability | 3,404 | |
Reinsurance related embedded derivatives, included in accounts payable and accrued liabilities | Level 1 | | |
Derivatives: | | |
Derivative liability | 0 | |
Reinsurance related embedded derivatives, included in accounts payable and accrued liabilities | Level 2 | | |
Derivatives: | | |
Derivative liability | 101 | |
Reinsurance related embedded derivatives, included in accounts payable and accrued liabilities | Level 3 | | |
Derivatives: | | |
Derivative liability | 0 | |
Reinsurance related embedded derivatives, included in accounts payable and accrued liabilities | Fair Value | | |
Derivatives: | | |
Derivative liability | 101 | |
Reinsurance related embedded derivatives, included in accounts payable and accrued liabilities | Carrying Value | | |
Derivatives: | | |
Derivative liability | 101 | |
Asset-backed securities | | |
Assets, Fair Value Disclosure [Abstract] | | |
Fixed maturity securities, available for sale | 6,266 | |
Asset-backed securities | Level 1 | | |
Assets, Fair Value Disclosure [Abstract] | | |
Fixed maturity securities, available for sale | 0 | |
Asset-backed securities | Level 2 | | |
Assets, Fair Value Disclosure [Abstract] | | |
Fixed maturity securities, available for sale | 4,916 | |
Asset-backed securities | Level 3 | | |
Assets, Fair Value Disclosure [Abstract] | | |
Fixed maturity securities, available for sale | 1,350 | |
Asset-backed securities | Fair Value | | |
Assets, Fair Value Disclosure [Abstract] | | |
Fixed maturity securities, available for sale | 6,266 | |
Asset-backed securities | Carrying Value | | |
Assets, Fair Value Disclosure [Abstract] | | |
Fixed maturity securities, available for sale | 6,266 | |
Commercial mortgage-backed securities | | |
Assets, Fair Value Disclosure [Abstract] | | |
Fixed maturity securities, available for sale | 2,829 | 22 |
Commercial mortgage-backed securities | Level 1 | | |
Assets, Fair Value Disclosure [Abstract] | | |
Fixed maturity securities, available for sale | 0 | 0 |
Commercial mortgage-backed securities | Level 2 | | |
Assets, Fair Value Disclosure [Abstract] | | |
Fixed maturity securities, available for sale | 2,803 | 22 |
Commercial mortgage-backed securities | Level 3 | | |
Assets, Fair Value Disclosure [Abstract] | | |
Fixed maturity securities, available for sale | 26 | 0 |
Commercial mortgage-backed securities | Fair Value | | |
Assets, Fair Value Disclosure [Abstract] | | |
Fixed maturity securities, available for sale | 2,829 | 22 |
Commercial mortgage-backed securities | Carrying Value | | |
Assets, Fair Value Disclosure [Abstract] | | |
Fixed maturity securities, available for sale | 2,829 | 22 |
Corporates | | |
Assets, Fair Value Disclosure [Abstract] | | |
Fixed maturity securities, available for sale | 14,735 | 1,557 |
Corporates | Level 1 | | |
Assets, Fair Value Disclosure [Abstract] | | |
Fixed maturity securities, available for sale | 25 | 0 |
Corporates | Level 2 | | |
Assets, Fair Value Disclosure [Abstract] | | |
Fixed maturity securities, available for sale | 13,421 | 1,540 |
Corporates | Level 3 | | |
Assets, Fair Value Disclosure [Abstract] | | |
Fixed maturity securities, available for sale | 1,289 | 17 |
Corporates | Fair Value | | |
Assets, Fair Value Disclosure [Abstract] | | |
Fixed maturity securities, available for sale | 14,735 | 1,557 |
Corporates | Carrying Value | | |
Assets, Fair Value Disclosure [Abstract] | | |
Fixed maturity securities, available for sale | 14,735 | 1,557 |
Hybrids | | |
Assets, Fair Value Disclosure [Abstract] | | |
Fixed maturity securities, available for sale | 994 | 30 |
Hybrids | Level 1 | | |
Assets, Fair Value Disclosure [Abstract] | | |
Fixed maturity securities, available for sale | 175 | 0 |
Hybrids | Level 2 | | |
Assets, Fair Value Disclosure [Abstract] | | |
Fixed maturity securities, available for sale | 815 | 30 |
Hybrids | Level 3 | | |
Assets, Fair Value Disclosure [Abstract] | | |
Fixed maturity securities, available for sale | 4 | 0 |
Hybrids | Fair Value | | |
Assets, Fair Value Disclosure [Abstract] | | |
Fixed maturity securities, available for sale | 994 | 30 |
Hybrids | Carrying Value | | |
Assets, Fair Value Disclosure [Abstract] | | |
Fixed maturity securities, available for sale | 994 | 30 |
Municipals | Level 1 | | |
Assets, Fair Value Disclosure [Abstract] | | |
Fixed maturity securities, available for sale | 0 | 0 |
Municipals | Level 2 | | |
Assets, Fair Value Disclosure [Abstract] | | |
Fixed maturity securities, available for sale | 1,360 | 93 |
Municipals | Level 3 | | |
Assets, Fair Value Disclosure [Abstract] | | |
Fixed maturity securities, available for sale | 43 | 0 |
Municipals | Fair Value | | |
Assets, Fair Value Disclosure [Abstract] | | |
Fixed maturity securities, available for sale | 1,403 | 93 |
Municipals | Carrying Value | | |
Assets, Fair Value Disclosure [Abstract] | | |
Fixed maturity securities, available for sale | 1,403 | 93 |
Residential mortgage-backed securities | | |
Assets, Fair Value Disclosure [Abstract] | | |
Fixed maturity securities, available for sale | 825 | 40 |
Residential mortgage-backed securities | Level 1 | | |
Assets, Fair Value Disclosure [Abstract] | | |
Fixed maturity securities, available for sale | 0 | 0 |
Residential mortgage-backed securities | Level 2 | | |
Assets, Fair Value Disclosure [Abstract] | | |
Fixed maturity securities, available for sale | 342 | 40 |
Residential mortgage-backed securities | Level 3 | | |
Assets, Fair Value Disclosure [Abstract] | | |
Fixed maturity securities, available for sale | 483 | 0 |
Residential mortgage-backed securities | Fair Value | | |
Assets, Fair Value Disclosure [Abstract] | | |
Fixed maturity securities, available for sale | 825 | 40 |
Residential mortgage-backed securities | Carrying Value | | |
Assets, Fair Value Disclosure [Abstract] | | |
Fixed maturity securities, available for sale | 825 | 40 |
U.S. Government | | |
Assets, Fair Value Disclosure [Abstract] | | |
Fixed maturity securities, available for sale | 342 | 288 |
U.S. Government | Level 1 | | |
Assets, Fair Value Disclosure [Abstract] | | |
Fixed maturity securities, available for sale | 342 | 0 |
U.S. Government | Level 2 | | |
Assets, Fair Value Disclosure [Abstract] | | |
Fixed maturity securities, available for sale | 0 | 288 |
U.S. Government | Level 3 | | |
Assets, Fair Value Disclosure [Abstract] | | |
Fixed maturity securities, available for sale | 0 | 0 |
U.S. Government | Fair Value | | |
Assets, Fair Value Disclosure [Abstract] | | |
Fixed maturity securities, available for sale | 342 | 288 |
U.S. Government | Carrying Value | | |
Assets, Fair Value Disclosure [Abstract] | | |
Fixed maturity securities, available for sale | 342 | 288 |
Foreign Governments | | |
Assets, Fair Value Disclosure [Abstract] | | |
Fixed maturity securities, available for sale | 193 | 60 |
Foreign Governments | Level 1 | | |
Assets, Fair Value Disclosure [Abstract] | | |
Fixed maturity securities, available for sale | 0 | 0 |
Foreign Governments | Level 2 | | |
Assets, Fair Value Disclosure [Abstract] | | |
Fixed maturity securities, available for sale | 176 | 60 |
Foreign Governments | Level 3 | | |
Assets, Fair Value Disclosure [Abstract] | | |
Fixed maturity securities, available for sale | 17 | 0 |
Foreign Governments | Fair Value | | |
Assets, Fair Value Disclosure [Abstract] | | |
Fixed maturity securities, available for sale | 193 | 60 |
Foreign Governments | Carrying Value | | |
Assets, Fair Value Disclosure [Abstract] | | |
Fixed maturity securities, available for sale | 193 | 60 |
Equity securities | Level 1 | | |
Assets, Fair Value Disclosure [Abstract] | | |
Equity securities | 791 | |
Equity securities | Level 2 | | |
Assets, Fair Value Disclosure [Abstract] | | |
Equity securities | 0 | |
Equity securities | Level 3 | | |
Assets, Fair Value Disclosure [Abstract] | | |
Equity securities | 5 | |
Equity securities | Fair Value | | |
Assets, Fair Value Disclosure [Abstract] | | |
Equity securities | 796 | |
Equity securities | Carrying Value | | |
Assets, Fair Value Disclosure [Abstract] | | |
Equity securities | 796 | |
Preferred securities | | |
Assets, Fair Value Disclosure [Abstract] | | |
Equity securities | 1,341 | 323 |
Preferred securities | Level 1 | | |
Assets, Fair Value Disclosure [Abstract] | | |
Equity securities | 490 | 65 |
Preferred securities | Level 2 | | |
Assets, Fair Value Disclosure [Abstract] | | |
Equity securities | 851 | 258 |
Preferred securities | Level 3 | | |
Assets, Fair Value Disclosure [Abstract] | | |
Equity securities | 0 | 0 |
Preferred securities | Fair Value | | |
Assets, Fair Value Disclosure [Abstract] | | |
Equity securities | 1,341 | 323 |
Preferred securities | Carrying Value | | |
Assets, Fair Value Disclosure [Abstract] | | |
Equity securities | 1,341 | 323 |
Subscription agreements | Level 1 | | |
Assets, Fair Value Disclosure [Abstract] | | |
Equity securities | 0 | |
Subscription agreements | Level 2 | | |
Assets, Fair Value Disclosure [Abstract] | | |
Equity securities | 199 | |
Subscription agreements | Level 3 | | |
Assets, Fair Value Disclosure [Abstract] | | |
Equity securities | 0 | |
Subscription agreements | Fair Value | | |
Assets, Fair Value Disclosure [Abstract] | | |
Equity securities | 199 | |
Subscription agreements | Carrying Value | | |
Assets, Fair Value Disclosure [Abstract] | | |
Equity securities | 199 | |
Other long-term investments | Level 1 | | |
Assets, Fair Value Disclosure [Abstract] | | |
Other long-term investments | 0 | 0 |
Other long-term investments | Level 2 | | |
Assets, Fair Value Disclosure [Abstract] | | |
Other long-term investments | 0 | 0 |
Other long-term investments | Level 3 | | |
Assets, Fair Value Disclosure [Abstract] | | |
Other long-term investments | 50 | 120 |
Other long-term investments | Fair Value | | |
Assets, Fair Value Disclosure [Abstract] | | |
Other long-term investments | 50 | 120 |
Other long-term investments | Carrying Value | | |
Assets, Fair Value Disclosure [Abstract] | | |
Other long-term investments | $ 50 | $ 120 |