Stock Incentive Plan (Schedule of Nonvested Restricted Stock Units Activity) (Details) - shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement with Individual, Shares Issued	4,097,497
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	5 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
RSUs granted and unvested at beginning of period:	4,158,325,000	5,330,445,000	4,491,520,000
Granted	1,000,559,000	997,522,000	1,154,950,000
Vested	(77,250,000)	(1,938,000,000)	(81,500,000)
Canceled	(219,536,000)	(231,642,000)	(234,525,000)
RSUs granted and unvested at end of period:	4,862,098,000	4,158,325,000	5,330,445,000