Goodwill and Other Intangible Assets (Estimated Future Amortization Expense) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013
Goodwill And Other Intangible Assets Life and Expense [Line Items]
Estimated amortization expense of identifiable intangible assets year one	$ 89
Estimated amortization expense of identifiable intangible assets year two	76
Estimated amortization expense of identifiable intangible assets year three	65
Estimated amortization expense of identifiable intangible assets year four	56
Estimated amortization expense of identifiable intangible assets year five	$ 49