Equity (Narrative) (Details) $ in Billions |
12 Months Ended |
|---|---|
|
Dec. 31, 2015
USD ($)
| |
| Number of votes entitled of each class B common stock | 15 |
| New Authorization [Member] | |
| Stock Repurchase Program Authorized Amount | $ 10 |
| Class A Common Stock [Member] | |
| Voting power | 66.67% |
| Class B Common Stock [Member] | |
| Voting power | 33.33% |