Other Current Assets (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended		12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2012	Jun. 30, 2011
Other Assets [Abstract]
Financing Receivable, Allowance for Credit Losses	$ 16		$ 15	$ 16
Unrealized gains on derivative contracts	1,381		969	1,381
Deferred receivables consideration	900		757	900
Customer Omnibus Receivable	1,093		1,298	1,093
Financing Receivable, Net	724		576	724
Other current assets	2,450		2,750	2,450
Total other current assets	6,548		6,350	6,548
Provision for Other Credit Losses	3		2
Financing Receivable, Allowance for Credit Losses, Write-downs			1
Allowance for credit losses adjustment	2		2
Interest on financing receivables	$ 15	$ 12	$ 26	$ 29	$ 26	$ 22