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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Available-for-sale Debt Securities, Amortized Cost Basis | $ 55,742 | $ 56,965
Available-for-sale Equity Securities, Amortized Cost Basis | 812 | 1,135
Available-for-sale Securities, Equity Securities | 875 | 1,121
Variable Interest Entity, Consolidated, Carrying Amount, Assets | $ 5 | $ 166
Common stock, par value | $ 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 | 111,275,234 | 89,102,038
Commercial Loan [Member] |  |
Allowance for Loan and Lease Losses, Real Estate | $ 19 | $ 23
Fixed Maturities [Member] |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets | 0 | 150
Equity Securities [Member] |  |
Available-for-sale Equity Securities, Amortized Cost Basis | 0 | 293
Available-for-sale Securities, Equity Securities | 0 | 282
Partnership Interest [Member] |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets | 0 | 2
Other Liabilities [Member] |  |
Other liabilities, variable interest entity liabilities | 5 | 12
Other Assets [Member] |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets | 0 | 0
Short-term Investments [Member] |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets | 0 | 3
Cash [Member] |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets | 5 | 10
Equity Securities [Member] |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets | 0 | 1
Equity Securities [Member] |  |
Available-for-sale Equity Securities, Amortized Cost Basis | 812 | 842
Available-for-sale Securities, Equity Securities | $ 875 | $ 839

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