Interim Condensed Consolidated Financial Statements (Details) (USD $)					0 Months Ended	9 Months Ended
	Sep. 30, 2014	Aug. 31, 2014	Jun. 30, 2014	Dec. 31, 2013	Feb. 04, 2014 Common Class A [Member]	Sep. 30, 2014 Common Class A [Member]	Sep. 30, 2014 Stock-based compensation plan [Member]
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount		$ 2,000,000,000	$ 1,500,000,000
Stock repurchased during period, shares						2,700,000	849,465
Stock repurchased during period, value						130,246,000	41,042,000
Remaining available balance under Board authorization for stock repurchases						871,899,000
Stock split ratio					2
Common stock dividend rate					100.00%
Amount of unrecognized tax benefits netted against deferred tax asset	$ 81,161,000			$ 74,196,000