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Income Taxes (Schedule of Unrecognized tax benefits) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Schedule of Unrecognized Tax Benefits [Abstract]      
Balance, January 1 $ 178 $ 178 $ 190
Additions for tax positions of the current year 17 13 9
Additions for tax positions of prior years 6 16 10
Reductions for tax positions of prior years (81) (15) (24)
Settlements during the period (3) (5) (1)
Lapses of applicable statute of limitation 4 9 6
Balance, December 31 $ 113 $ 178 $ 178