Financial and Derivative Instruments (Details 2) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Offsetting Assets [Abstract]
Derivative Assets, Gross Amount Recognized	$ 1,179	$ 1,052
Derivative Assets, Gross Amounts Offset	1,136	1,020
Derivative Assets, Net Amounts Presented	43	32
Derivative Assets, Gross Amounts Not Offset	0	0
Derivative Assets, Net Amounts Presented	43	32
Offsetting Liabilities [Abstract]
Derivative Liabilities, Gross Amount Recognized	1,147	1,129
Derivative Liabilities, Gross Amounts Offset	1,136	1,020
Derivative Liabilities, Net Amounts Presented	11	109
Derivative Liabilities, Gross Amounts Not Offset	0	0
Derivative Liabilities, Net Amounts Presented	$ 11	$ 109