Significant Accounting Policies (Accumulated Other Comprehensive Income (Loss)) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (16)
Other Comprehensive Income Before Reclassifications	(1)
Amounts Reclassified From Accumulated Other Comprehensive Income	0
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax	(1)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(17)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	1
Other Comprehensive Income Before Reclassifications	0
Amounts Reclassified From Accumulated Other Comprehensive Income	0
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax	0
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	(17)
Other Comprehensive Income Before Reclassifications	(1)
Amounts Reclassified From Accumulated Other Comprehensive Income	0
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax	(1)
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (18)