Goodwill and Other Intangible Assets, Net (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2013	Mar. 31, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Finite-Lived Intangible Assets [Line Items]
Intangible assets, pre-tax amortization expense	$ 23		$ 24	$ 71	$ 73
Goodwill, Impairment Loss		0
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Future Amortization Expense, Year One, assuming no additional transactions occur that require the amortization of intangible assets	94			94
Future Amortization Expense, Year Two, assuming no additional transactions occur that require the amortization of intangible assets	94			94
Future Amortization Expense, Year Three, assuming no additional transactions occur that require the amortization of intangible assets	94			94
Future Amortization Expense, Year Four, assuming no additional transactions occur that require the amortization of intangible assets	94			94
Future Amortization Expense, Year Five, assuming no additional transactions occur that require the amortization of intangible assets	$ 94			$ 94