Other Current Assets (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Other Assets [Abstract]
Unrealized gains on derivative contracts	$ 995		$ 995		$ 897
Deferred receivables consideration	703		703		511
Receivables from Customers	1,106		1,106		1,532
Financing Receivable, Net	630		630		402
Other current assets	1,733		1,733		2,714
Total other current assets	5,167		5,167		6,056
Financing Receivable, Allowance for Credit Losses	6		6		$ 11
Interest on financing receivables	$ 5	$ 4	$ 12	$ 12