Significant Accounting Policies (Accumulated Other Comprehensive Income) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (22)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	4
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	2
Other Comprehensive Income (Loss), Net of Tax	6	(2)	(4)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(16)	(22)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	0
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	1
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0
Other Comprehensive Income (Loss), Net of Tax	1
Accumulated Other Comprehensive Income (Loss), Net of Tax	1
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(22)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	3
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	2
Other Comprehensive Income (Loss), Net of Tax	5	(2)	(4)
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (17)	$ (22)