Income Taxes (Unaudited) (Details 1) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2018
Income Tax Contingency [Line Items]
Decrease in Unrecognized Tax Benefits is Reasonably Possible	$ 110		$ 110
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Effective Income Tax Rate Reconciliation, Deduction, Other, Amount			47	$ 84
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount			22
Effective Income Tax Rate Reconciliation, Tax Settlement, Amount			42
Income Tax Expense (Benefit)	$ 255	$ 213	$ 388	$ 333
Effective income tax rate	31.60%	29.20%	24.60%	23.70%
Maximum | Scenario, Forecast [Member]
Income Tax Contingency [Line Items]
Tax Adjustments, Settlements, and Unusual Provisions					$ (30)