Other Assets and Investments (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Long Lived Assets Held-for-sale [Line Items]
Investment Owned, Balance, Shares	3,421,306	3,421,306
Investment Owned, at Fair Value	$ 41	$ 41
Available-for-sale Securities, Gross Unrealized Gains	25	24
Available For Sale Securities Gross Unrealized Holding Gains After Tax	26	26
Proceeds from Dividends Received	129	168	126
Equity Method Investment, Dividends or Distributions	11	8	4
Assets Held-for-sale, Current	43
Return of investment in The Reserve Primary Fund			26
Land [Member]
Long Lived Assets Held-for-sale [Line Items]
Assets Held-for-sale, Current	29
Other Intangible Assets [Member]
Long Lived Assets Held-for-sale [Line Items]
Assets Held-for-sale, Current	$ 14