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Schedule I (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Other investments (cost – $4,417 and $4,270) | $ 4,672 | $ 4,519
Cost or Amortized Cost | 100,799 |
Fair Value | 102,497 |
Amount at Which Shown in the Balance Sheet | 102,358 |
Fixed maturities available for sale |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost or Amortized Cost | 77,835 |
Fair Value | 78,939 |
Amount at Which Shown in the Balance Sheet | 78,939 |
Fixed maturities available for sale | U.S. Treasury and agency |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost or Amortized Cost | 3,701 |
Fair Value | 3,698 |
Amount at Which Shown in the Balance Sheet | 3,698 |
Fixed maturities available for sale | Foreign |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost or Amortized Cost | 20,514 |
Fair Value | 21,030 |
Amount at Which Shown in the Balance Sheet | 21,030 |
Fixed maturities available for sale | Corporate securities |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost or Amortized Cost | 23,453 |
Fair Value | 23,996 |
Amount at Which Shown in the Balance Sheet | 23,996 |
Fixed maturities available for sale | Mortgage backed-securities |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost or Amortized Cost | 15,279 |
Fair Value | 15,290 |
Amount at Which Shown in the Balance Sheet | 15,290 |
Fixed maturities available for sale | States, municipalities, and political subdivisions |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost or Amortized Cost | 14,888 |
Fair Value | 14,925 |
Amount at Which Shown in the Balance Sheet | 14,925 |
Fixed maturities held to maturity |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost or Amortized Cost | 14,335 |
Fair Value | 14,474 |
Amount at Which Shown in the Balance Sheet | 14,335 |
Fixed maturities held to maturity | U.S. Treasury and agency |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost or Amortized Cost | 908 |
Fair Value | 915 |
Amount at Which Shown in the Balance Sheet | 908 |
Fixed maturities held to maturity | Foreign |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost or Amortized Cost | 1,738 |
Fair Value | 1,757 |
Amount at Which Shown in the Balance Sheet | 1,738 |
Fixed maturities held to maturity | Corporate securities |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost or Amortized Cost | 3,159 |
Fair Value | 3,219 |
Amount at Which Shown in the Balance Sheet | 3,159 |
Fixed maturities held to maturity | Mortgage backed-securities |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost or Amortized Cost | 2,724 |
Fair Value | 2,742 |
Amount at Which Shown in the Balance Sheet | 2,724 |
Fixed maturities held to maturity | States, municipalities, and political subdivisions |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost or Amortized Cost | 5,806 |
Fair Value | 5,841 |
Amount at Which Shown in the Balance Sheet | 5,806 |
Industrial, miscellaneous, and all others |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost or Amortized Cost | 737 |
Fair Value | 937 |
Amount at Which Shown in the Balance Sheet | 937 |
Short-term investments |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost or Amortized Cost | 3,561 |
Fair Value | 3,561 |
Amount at Which Shown in the Balance Sheet | 3,561 |
Other investments |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost or Amortized Cost | 4,331 |
Fair Value | 4,586 |
Amount at Which Shown in the Balance Sheet | 4,586 |
All Related Party [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Other investments (cost – $4,417 and $4,270) | $ 86 |

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