Investments, Investment Income and Gains and Losses - Other Long-Term Investments (Details) - USD ($) $ in Millions |
12 Months Ended | |
---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
|
Other Long Term Investments [Line Items] | ||
Percentage of the committed amounts expected to be disbursed in the next fiscal year | 30.00% | |
Other long-term investments | $ 1,901 | |
Other long-term investments, including disposal groups | $ 2,403 | |
Unfunded Commitments | 1,954 | |
Real Estate Entities [Member] | ||
Other Long Term Investments [Line Items] | ||
Other long-term investments | 679 | |
Other long-term investments, including disposal groups | 788 | |
Unfunded Commitments | 551 | |
Security Partnerships [Member] | ||
Other Long Term Investments [Line Items] | ||
Other long-term investments | 1,045 | |
Other long-term investments, including disposal groups | 1,409 | |
Unfunded Commitments | 1,379 | |
Other Long Term Investments [Member] | ||
Other Long Term Investments [Line Items] | ||
Other long-term investments | $ 177 | |
Other long-term investments, including disposal groups | 206 | |
Unfunded Commitments | $ 24 |