Income Taxes (Unaudited) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2016
Income Tax Contingency [Line Items]
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount			$ 38
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	$ (75)		(75)
Income Tax Expense (Benefit)	$ 205	$ 245	$ 425	$ 452
Effective income tax rate	27.90%	32.40%	29.50%	29.30%
Tax Adjustments, Settlements, and Unusual Provisions			$ 51
Maximum | Scenario, Forecast [Member]
Income Tax Contingency [Line Items]
Tax Adjustments, Settlements, and Unusual Provisions					$ (40)