Quarterly report pursuant to Section 13 or 15(d)

Investments (Details 5)

v3.5.0.2
Investments (Details 5) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Investments [Abstracts]    
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis $ 1,994  
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value 1,994  
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Amortized Cost Basis 2,277  
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value 2,336  
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Amortized Cost Basis 186  
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value 204  
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis 335  
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value 356  
Available-for-sale Securities, Amortized Cost Basis 6,058 $ 8,166
Available-for-sale Securities Fair Value 6,605 8,606
Cost Method Investments [Abstract]    
Cost-method Investments, Aggregate Carrying Amount 143 190
Equity Securities [Member]    
Investments [Abstracts]    
Available-for-sale Securities, Amortized Cost Basis 1,266 3,573
Available-for-sale Securities Fair Value $ 1,715 $ 3,974