Goodwill and Other Intangible Assets (Summary of Changes in Customer Related Other Intangible Assets) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Finite-Lived Intangible Assets [Line Items]
Intangible assets, beginning balance	$ 2,216
Amortization expense	(65)	(128)
Intangible assets, ending balance	1,997
Customer-Related and Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, beginning balance	580
Amortization expense	(65)
Intangible assets, ending balance	$ 515