Significant Accounting Policies (Accumulated Other Comprehensive Income (Loss)) (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	$ (158)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	13
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	9
Other Comprehensive Income (Loss), Net of Tax	22	0	(9)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(136)	(158)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(4)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0
Other Comprehensive Income (Loss), Net of Tax	0
Accumulated Other Comprehensive Income (Loss), Net of Tax	(4)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(8)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	2
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0
Other Comprehensive Income (Loss), Net of Tax	2	1
Accumulated Other Comprehensive Income (Loss), Net of Tax	(6)	(8)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(148)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	13
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	9
Other Comprehensive Income (Loss), Net of Tax	22	(2)	(9)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(126)	(148)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	2
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(2)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0
Other Comprehensive Income (Loss), Net of Tax	(2)	1
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ 0	$ 2