Other Current Assets (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Other Assets [Abstract]
Unrealized gains on derivative contracts	$ 915		$ 915		$ 897
Deferred receivables consideration	1,067		1,067		511
Receivables from Customers	1,136		1,136		1,532
Financing Receivable, Net	471		471		402
Other current assets	2,594		2,594		2,714
Total other current assets	6,183		6,183		6,056
Financing Receivable, Allowance for Credit Losses	8		8		$ 11
Interest on financing receivables	$ 5	$ 5	$ 17	$ 17