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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Available-for-sale Debt Securities, Amortized Cost Basis | $ 35,330 | $ 35,612
Marketable Securities | 1,123 | 0
Marketable Securities, Equity Securities | 1,044 |
Available-for-sale Equity Securities, Amortized Cost Basis | $ 0 | $ 907
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 | 384,923,222.00 | 384,923,222.00
Treasury Stock, Shares | 26,846,017 | 28,088,186
Commercial Loan [Member] |  |
Allowance for Loan and Lease Losses, Real Estate | $ 1 | $ 1

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