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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Available-for-sale Debt Securities, Amortized Cost Basis | $ 54,800 | $ 53,805
Available-for-sale Equity Securities, Amortized Cost Basis | 964 | 1,020
Available-for-sale Securities, Equity Securities | $ 1,055 | $ 1,097
Common stock, par value | $ 0.01 | $ 0.01
Common stock, shares authorized | 1,500,000,000 | 1,500,000,000
Common stock, shares issued | 402,923,222 | 402,923,222
Treasury stock, shares | 40,103,642 | 28,974,069
Commercial Loan [Member] |  |
Allowance for Loan and Lease Losses, Real Estate | $ 1 | $ 19
Fixed Maturities [Member] |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets | 0 | 0
Equity Securities [Member] |  |
Available-for-sale Securities, Equity Securities | 0 | 0
Other Assets [Member] |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets | 0 | 0
Short-term Investments [Member] |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets | 0 | 0
Cash [Member] |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets | 0 | 5
Equity Securities [Member] |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets | 0 | 0
Debt Securities [Member] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 40,807 | 39,911
Partnership Interest [Member] |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets | $ 0 | $ 0

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