Taxes on Income Narrative (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Income Tax Examination [Line Items]
Unrecognized Tax Benefits Capitalized	$ 2
Unrecognized Tax Benefits State Filing Positions	14
Unrecognized tax benfits for state filing positions, net of federal tax	9
Possible Reduction of Unrecognized Tax Benefits	4
Possible Reduction of Unrecognized Tax Benefits Net of Tax	2
Income Tax Examination, Penalties and Interest Expense	1
Income Tax Examination Penalities and Interest Accrued	2
Penalties and Interest Accrued Net of Tax	2
Income Tax Examination, Year under Examination	2006
Minimum [Member]
Income Tax Examination [Line Items]
Income Tax Examination, Range of Possible Losses	545
Maximum [Member]
Income Tax Examination [Line Items]
Income Tax Examination, Range of Possible Losses	$ 690