v3.5.0.2
Non-Marketable Investments (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Investments, All Other Investments [Abstract]          
Equity method investments $ 1,700   $ 1,700   $ 1,600
Loss on equity method investments 43 $ 59 148 $ 89  
Cost method investments 3,000   3,000   2,600
Fair value of cost method investments 8,100   8,100   7,500
Variable Interest Entity [Line Items]          
Cost of non-marketable debt securities 1,100   1,100   1,000
VIE, Not Primary Beneficiary, Aggregated Disclosure          
Variable Interest Entity [Line Items]          
Net assets of VIE 1,300   1,300   1,300
Maximum loss exposure $ 1,300   $ 1,300   $ 1,300