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Consolidated Balance Sheets Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Available-for-sale Debt Securities, Amortized Cost Basis |  | $ 56,965 | $ 55,362
Variable Interest Entity, Consolidated, Carrying Amount, Assets |  | 166 | 246
Available-for-sale Equity Securities, Amortized Cost Basis |  | 1,135 | 1,027
Available-for-sale Securities, Equity Securities |  | 1,121 | 1,047
Trading Securities, Equity | [1] | 11 | 11
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities | [2] | $ 12 | $ 6
Common Stock, Par or Stated Value Per Share |  | $ 0.01 | $ 0.01
Common Stock, Shares Authorized |  | 1,500,000,000 | 1,500,000,000
Common Stock, Shares, Issued |  | 490,923,222 | 490,923,222
Treasury Stock, Shares |  | 89,102,038 | 66,507,690
Variable Interest Entity, Primary Beneficiary [Member] |  |  |
Available-for-sale Equity Securities, Amortized Cost Basis |  | $ 1 | $ 0
Equity Securities [Member] |  |  |
Available-for-sale Equity Securities, Amortized Cost Basis |  | 842 | 676
Available-for-sale Securities, Equity Securities |  | 839 | 699
Equity Securities [Member] |  |  |
Available-for-sale Equity Securities, Amortized Cost Basis |  | 293 | 351
Available-for-sale Securities, Equity Securities |  | 282 | 348
Fixed Maturities [Member] |  |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets |  | 150 | 218
Short-term Investments [Member] |  |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets |  | 3 | 16
Cash [Member] |  |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets |  | 10 | 9
Commercial Loan [Member] |  |  |
Allowance for Loan and Lease Losses, Real Estate |  | 23 | 18
Limited Partnerships and Other Alternative Investments [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets |  | 2 | 3
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities | [2] | $ 0 | $ 1
[1] | [1]Included in other investments on the Consolidated Balance Sheets.
[2] | Included in other liabilities in the Company’s Consolidated Balance Sheets.

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- Definition The reserve to cover probable credit losses related to specifically identified fixed maturity real estate loans as well as probable credit losses inherent in the remainder of that loan portfolio. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6873192&loc=d3e21338-158488 + Details
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