Financial and Derivative Instruments (Details 2) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Offsetting Assets [Abstract]
Derivative Assets, Gross Amount Recognized	$ 1,290	$ 2,459
Derivative Assets, Gross Amounts Offset	1,267	2,254
Derivative Assets, Net Amounts Presented	23	205
Derivative Assets, Gross Amounts Not Offset	0	0
Derivative Assets, Net Amount	23	205
Offsetting Liabilities [Abstract]
Derivative Liabilities, Gross Amount Recognized	1,341	2,307
Derivative Liabilities, Gross Amounts Offset	1,267	2,254
Derivative Liabilities, Net Amounts Presented	74	53
Derivative Liabilities, Gross Amounts Not Offset	0	0
Derivative Liabilities, Net Amount	$ 74	$ 53