Income Tax (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Income Tax [Line Items]
Net operating loss carryforwards	$ 484
Unrecognized tax benefits	130	93	86	118
Accrued liability for uncertain tax position	88
Uncertain tax positions	130
Increase in current liabilities	67
Reduction to current deferred tax assets	63
New York State [Member]
Income Tax [Line Items]
Net operating loss carryforwards	220
Unrecognized tax benefits	$ 11