v3.8.0.1

Investments (Trading Account Assets Supporting Insurance Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Amortized Cost or Cost |  | $ 21,364 | $ 21,407
Fair Value | [1] | 22,097 | 21,840
Fixed maturities |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Amortized Cost or Cost |  | 19,841 | 19,655
Fair Value |  | 20,209 | 19,850
Equity securities |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Amortized Cost or Cost |  | 1,278 | 1,097
Fair Value |  | 1,643 | 1,335
Short-term investments and cash equivalents |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Amortized Cost or Cost |  | 245 | 655
Fair Value |  | 245 | 655
Corporate securities | Fixed maturities |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Amortized Cost or Cost |  | 13,816 | 13,903
Fair Value |  | 14,073 | 13,997
Commercial mortgage-backed securities | Fixed maturities |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Amortized Cost or Cost |  | 2,294 | 2,032
Fair Value |  | 2,311 | 2,052
Residential mortgage-backed securities | Fixed maturities |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Amortized Cost or Cost |  | 961 | 1,142
Fair Value |  | 966 | 1,150
Asset-backed securities | Fixed maturities |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Amortized Cost or Cost |  | 1,363 | 1,333
Fair Value |  | 1,392 | 1,349
Foreign government bonds | Fixed maturities |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Amortized Cost or Cost |  | 1,050 | 915
Fair Value |  | 1,057 | 926
U.S. government authorities and agencies and obligations of U.S. states | Fixed maturities |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Amortized Cost or Cost |  | 357 | 330
Fair Value |  | $ 410 | $ 376
[1] | See Note 5 for details of balances associated with variable interest entities.

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