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Schedule I Summary of Investments - Other Than Investments in Affiliates Level 4 (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | $ 68,630 |
Assets, Fair Value Disclosure | 172,243 | $ 181,633
Trading Securities, Equity | 11 | 11
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 70,637 |
Equity Securities, Investment Summary [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 1,020 |
Summary of Investments, Other than Investments in Related Parties, Fair Value | 1,097 |
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 1,097 |
Industrial, Miscellaneous, and All Others [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 860 |
Summary of Investments, Other than Investments in Related Parties, Fair Value | 932 |
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 932 |
Fixed Maturities [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 54,093 |
Summary of Investments, Other than Investments in Related Parties, Fair Value | 56,296 |
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 56,296 |
Foreign Government Debt [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 1,164 |
Summary of Investments, Other than Investments in Related Parties, Fair Value | 1,171 |
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 1,171 |
US Treasury and Government [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 7,474 |
Summary of Investments, Other than Investments in Related Parties, Fair Value | 7,626 |
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 7,626 |
Trading Securities [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 10 |
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 11 |
Equity Securities [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 1,030 |
Summary of Investments, Other than Investments in Related Parties, Fair Value | 1,108 |
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 1,108 |
Available-for-sale Securities [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 53,805 |
Summary of Investments, Other than Investments in Related Parties, Fair Value | 56,003 |
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 56,003 |
US States and Political Subdivisions Debt Securities [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 10,825 |
Summary of Investments, Other than Investments in Related Parties, Fair Value | 11,486 |
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 11,486 |
Mortgages [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 5,697 |
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 5,697 |
Public Utility, Bonds [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 5,024 |
Summary of Investments, Other than Investments in Related Parties, Fair Value | 5,285 |
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 5,285 |
Other Corporate Bonds [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 19,356 |
Summary of Investments, Other than Investments in Related Parties, Fair Value | 20,381 |
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 20,381 |
All Other Mortgage Backed and Asset Backed Securities [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 9,962 |
Summary of Investments, Other than Investments in Related Parties, Fair Value | 10,054 |
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 10,054 |
Nonredeemable Preferred Stock [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 160 |
Summary of Investments, Other than Investments in Related Parties, Fair Value | 165 |
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 165 |
Policy Loans [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 1,444 |
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 1,444 |
Futures Options and Miscellaneous [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 666 |
Summary of Investments, Other than Investments in Related Parties, Fair Value | 392 |
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 392 |
Short-term Investments [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 3,244 |
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 3,244 |
Investments in Partnerships and Trusts [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 2,456 |
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 2,456 |
Available-for-sale Securities [Member] | Fixed Maturities [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 288 |
Summary of Investments, Other than Investments in Related Parties, Carrying Amount | 293 |
Fixed Maturities [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Assets, Fair Value Disclosure |  | 503
Fixed Maturities [Member] | Available-for-sale Securities [Member] | Fixed Maturities [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Summary of Investments, Other than Investments in Related Parties, Fair Value | 293 |
Fair Value, Inputs, Level 3 [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Assets, Fair Value Disclosure | 4,375 | 3,810
Trading Securities, Equity | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member] | Mortgages [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Assets, Fair Value Disclosure | 5,721 | 5,736
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member] | Policy Loans [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Assets, Fair Value Disclosure | $ 1,444 | $ 1,447

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