Additional Financial Information Depreciation and Amortization (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Property, Plant and Equipment [Line Items]
Total depreciation and amortization	$ 161	$ 89
Amortization of intangible assets
Property, Plant and Equipment [Line Items]
Total depreciation and amortization	147	75
Amortization of capitalized software
Property, Plant and Equipment [Line Items]
Total depreciation and amortization	10	11
Depreciation of fixed assets
Property, Plant and Equipment [Line Items]
Total depreciation and amortization	$ 4	$ 3