Goodwill and Other Intangible Assets (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Definite-lived intangible assets
Carrying amount of indefinite-lived intangible assets	$ 631	$ 630
Carrying amount of indefinite-lived intangible assets	67	67
Gross Carrying Amount	547	541
Accumulated Amortization	(348)	(300)
Net Carrying Amount	199	241
Definite-lived intangible assets acquired during the year, amount assigned	2
Definite-lived intangible assets acquired during the year, weighted-average amortization period	5 years
Increase (decrease) to net definite-lived intangible assets due to changes in foreign currency exchange rates	1	4	0
Aggregate amortization expense for definite-lived intangible assets	45	47	45
Estimated intangible amortization expense for next five years:
2014	39
2015	31
2016	25
2017	21
2018	19
Customer relationships
Definite-lived intangible assets
Gross Carrying Amount	152	152
Accumulated Amortization	(87)	(72)
Net Carrying Amount	65	80
Contracts
Definite-lived intangible assets
Gross Carrying Amount	240	238
Accumulated Amortization	(167)	(146)
Net Carrying Amount	73	92
Other
Definite-lived intangible assets
Gross Carrying Amount	155	151
Accumulated Amortization	(94)	(82)
Net Carrying Amount	$ 61	$ 69