Accumulated Other Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Other Comprehensive Income (Loss), before Tax [Abstract]
Foreign currency translation adjustment	$ 23	$ (39)	$ 10
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax, [Abstract]
Net gain (loss) arising during the year	10	(36)	(16)
Effect of exchange rates on amounts included in AOCI	(2)	1	(2)
Amortization or curtailment recognition of prior service (credit) cost	(1)	(1)	(1)
Amortization or settlement recognition of net (gain) loss	9	6	14
Total	(16)	30	5
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax, [Abstract]
Unrealized holding gains arising during period	3	(4)	1
Realized gains reclassified in net income		(2)
Impairment charge reclassified into net income			7
Total	3	(6)	8
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax [Abstract]
Unrealized gains arising during the period	3
Total	3
Total other comprehensive income, before tax	45	(75)	13
Other Comprehensive Income (Loss), Tax [Abstract]
Foreign currency translation adjustment	0	0	0
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax [Abstract]
Net gain (loss) arising during the year	(4)	9	4
Effect of exchange rates on amounts included in AOCI	0	0	1
Amortization or curtailment recognition of prior service (credit) cost	1	1	1
Amortization or settlement recognition of net (gain) loss	(3)	(2)	(5)
Total	(6)	8	1
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax [Abstract]
Unrealized holding losses arising during period	0	1	0
Realized gains reclassified in net income		1
Impairment charge reclassified into net income			(3)
Total	0	2	(3)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax Effect [Abstract]
Unrealized gains arising during the period	0
Total	0
Total other comprehensive income, tax	(6)	10	(2)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other comprehensive income	23	(39)	10
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax [Abstract]
Net gain (loss) arising during the year	6	(27)	(12)
Effect of exchange rates on amounts included in AOCI	(2)	1	(1)
Amortization or curtailment recognition of prior service (credit) cost	0	0	0
Amortization or settlement recognition of net (gain) loss	6	4	9
Total	(10)	22	4
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax [Abstract]
Unrealized gains (losses) on securities	3	(3)	1
Realized gains reclassified in net income		(1)
Impairment charge reclassified into net income			4
Total	3	(4)	5
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax [Abstract]
Unrealized gains arising during the period	3
Total	3
Total other comprehensive income, net of tax	$ 39	$ (65)	$ 11