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Significant Accounting Policies Signficant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012
Comprehensive Income [Line Items]
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	$ (21)	$ (21)	$ (22)	$ (22)
Other Comprehensive Income Before Reclassifications	0	0
Amounts Reclassified From Accumulated Other Comprehensive Income	1	1
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax	$ 1	$ 1

The total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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