Significant Accounting Policies (Accumulated Other Comprehensive Income (Loss)) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss)	$ (136)
Other Comprehensive Income Before Reclassifications	(3)
Amounts Reclassified From Accumulated Other Comprehensive Income	2
Other Comprehensive Income (Loss), Net of Tax	(1)	2
Accumulated Other Comprehensive Income (Loss)	(137)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss)	(4)
Other Comprehensive Income Before Reclassifications	0
Amounts Reclassified From Accumulated Other Comprehensive Income	0
Other Comprehensive Income (Loss), Net of Tax	0
Accumulated Other Comprehensive Income (Loss)	(4)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss)	(6)
Other Comprehensive Income Before Reclassifications	0
Amounts Reclassified From Accumulated Other Comprehensive Income	0
Other Comprehensive Income (Loss), Net of Tax	0
Accumulated Other Comprehensive Income (Loss)	(6)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss)	(126)
Other Comprehensive Income Before Reclassifications	(2)
Amounts Reclassified From Accumulated Other Comprehensive Income	2
Other Comprehensive Income (Loss), Net of Tax	0
Accumulated Other Comprehensive Income (Loss)	(126)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss)	0
Other Comprehensive Income Before Reclassifications	(1)
Amounts Reclassified From Accumulated Other Comprehensive Income	0
Other Comprehensive Income (Loss), Net of Tax	(1)
Accumulated Other Comprehensive Income (Loss)	$ (1)