Other Current Assets (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Other Assets [Abstract]
Financing Receivable, Allowance for Credit Losses	$ 10		$ 10		$ 15
Unrealized gains on derivative contracts	876		876		969
Deferred receivables consideration	216		216		757
Receivables from Customers	1,528		1,528		1,298
Financing Receivable, Net	386		386		576
Other current assets	2,180		2,180		2,750
Total other current assets	5,186		5,186		6,350
Provision for Other Credit Losses			1
Allowance for credit losses adjustment			6
Interest on financing receivables	$ 4	$ 5	$ 12	$ 14