XML 61 R51.htm IDEA: XBRL DOCUMENT v2.4.0.8
Investments In Marketable Securities (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Gain Loss On Marketable Securities        
Realized losses on the sale of available-for-sale securities $ 0 $ 0 $ 0 $ 0
Other-than-temporary impairment of marketable securities 0 0 0 0
Gains included in earnings that relate to trading securities held at the reporting date 1,000,000 0 1,000,000 0
Unrealized gains on available-for-sale securities included in other comprehensive income 0 (1,000,000) 1,000,000 (1,000,000)
Gains reclassified out of other comprehensive income into earnings 0 0 1,000,000 0
Gross proceeds from sales of available-for-sale securities 1,071,000,000 1,513,000,000 3,394,000,000 5,160,000,000
Gross realized gains on sales $ 0 $ 0 $ 0 $ 1,000,000