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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