Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended			12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Mar. 31, 2015 Subsequent Event [Member]
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Unrecognized Tax Benefits	$ 1,039		$ 1,039		$ 1,069
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	929		929		939
Reported tax rate	103.80%	14.30%	(222.50%)	7.60%
Gross interest and penalties recognized in period			29
Net tax expense/benefits related to interest	10	11	19	20
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total	431		431		402
Potential Reduction In Unrecognized Tax Benefits Over Next Twelve Months As Result Of Concluding Certain Matters						$ 12