Income Tax Income Tax (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Deferred Tax Liabilities, Net	$ 8,554	$ 6,774
Foreign Tax Authority [Member]
Deferred Tax Liabilities, Gross	444
Undistributed Earnings of Foreign Subsidiaries	3,000
Deferred Tax Assets, Gross	264
Deferred Tax Liabilities, Net	$ 180