Available-for-Sale Securities Narrative (Details) (USD $)	6 Months Ended	12 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]
Cash Excluded from Available-for-Sale Debt Securities Table	$ 2,840,000,000	$ 621,800,000
Available-for-Sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions (securities)	64	40
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities	$ 0	$ 0