Debt (Schedule Of Debt) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Other notes	$ 205	$ 202
Total debt	9,635	10,409
3-month USD LIBOR plus 1 basis point due 2014 [Member]
Debt Instrument [Line Items]
Unsecured debt securities	150
0.95% - 5.00% due through 2023 [Member]
Debt Instrument [Line Items]
Unsecured debt securities	4,832	4,521
Debt interest rate - minimum	0.95%
Debt interest rate - maximum	5.00%
Debt Instrument, Maturity Date	Dec. 31, 2023
5.80% - 6.88% due through 2043 [Member]
Debt Instrument [Line Items]
Unsecured debt securities	2,392	3,591
Debt interest rate - minimum	5.80%
Debt interest rate - maximum	6.88%
Debt Instrument, Maturity Date	Dec. 31, 2043
7.25% – 8.75% due through 2043 [Member]
Debt Instrument [Line Items]
Unsecured debt securities	1,672	1,672
Debt interest rate - minimum	7.25%
Debt interest rate - maximum	8.75%
Debt Instrument, Maturity Date	Dec. 31, 2043
4.12% – 4.84% notes due through 2013 [member]
Debt Instrument [Line Items]
Non-recourse debt and notes		13
Debt interest rate - minimum	4.12%
Debt interest rate - maximum	4.84%
Debt Instrument, Maturity Date	Dec. 31, 2013
6.98% - 7.38% notes due through 2021 [Member]
Debt Instrument [Line Items]
Non-recourse debt and notes	233	231
Debt interest rate - minimum	6.98%
Debt interest rate - maximum	7.38%
Debt Instrument, Maturity Date	Dec. 31, 2013
Capital lease obligation due through 2017 [Member]
Debt Instrument [Line Items]
Capital lease obligations	$ 151	$ 179
Capital lease maturity year	12/31/2017