Finance Assets, Net (Schedule Of PMCC Leveraged Lease Charge) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Reduction to cumulative lease earnings related to the PMCC Leveraged Lease Charge	$ 0	$ 0	$ 7	$ 0	$ 0	$ 0	$ 490	$ 0	$ 7	$ 490
Provision for Income Taxes									(75)	137
Total			(68)				627		(68)	627
Reduction To Cumulative Lease Earnings [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Total							315
Interest On Tax Underpayments [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Total							312
Interest On Tax Underpayments [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Reduction to cumulative lease earnings related to the PMCC Leveraged Lease Charge									0	0
Provision for Income Taxes									(73)	312
Total									(73)	312
Reduction To Cumulative Lease Earnings [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Reduction to cumulative lease earnings related to the PMCC Leveraged Lease Charge									7	490
Provision for Income Taxes									(2)	(175)
Total									$ 5	$ 315