Other Current Assets (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Other Assets [Abstract]
Financing Receivable, Allowance for Credit Losses	$ 12		$ 12		$ 15
Unrealized gains on derivative contracts	1,531		1,531		969
Deferred receivables consideration	695		695		757
Receivables from Customers	1,489		1,489		1,298
Financing Receivable, Net	371		371		576
Other current assets	2,760		2,760		2,750
Total other current assets	6,846		6,846		6,350
Provision for Other Credit Losses			2
Allowance for credit losses adjustment			5
Interest on financing receivables	$ 5	$ 4	$ 17	$ 18