Finance Assets, net (Schedule of PMCC Leveraged Lease Charge) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net Revenues		$ 7
Benefit for Income Taxes		(75)
Total		(68)
Interest On Tax Underpayments [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net Revenues		0
Benefit for Income Taxes		(73)
Total	(68)	(73)
Reduction To Cumulative Lease Earnings [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net Revenues		7
Benefit for Income Taxes		(2)
Total		$ 5