Goodwill and Other Intangible Assets, net (Narrative) (Details) - USD ($)	3 Months Ended			6 Months Ended
	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible assets, pre-tax amortization expense	$ 21,000,000		$ 22,000,000	$ 43,000,000	$ 44,000,000
Estimated Amortization Expense, Year One, assuming no additional transactions occur that require the amortization of intangible assets	72,000,000			72,000,000
Estimated Amortization Expense, Year Two, assuming no additional transactions occur that require the amortization of intangible assets	72,000,000			72,000,000
Estimated Amortization Expense, Year Three, assuming no additional transactions occur that require the amortization of intangible assets	72,000,000			72,000,000
Estimated Amortization Expense, Year Four, assuming no additional transactions occur that require the amortization of intangible assets	72,000,000			72,000,000
Estimated Amortization Expense, Year Five, assuming no additional transactions occur that require the amortization of intangible assets	$ 72,000,000			$ 72,000,000
Goodwill and Intangible Asset Impairment		$ 0