Common Stock Split (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2013
Common Stock Split, Pro Forma Information [Line Items]
Stockholders' Equity Note, Stock Split, Conversion Ratio	2
Stockholders' Equity Note Percent of Dividend in Shares	100.00%
Common Stock, Par or Stated Value Per Share	$ 1.00
Common Stock [Member]
Common Stock Split, Pro Forma Information [Line Items]
Stock Issued During Period, Value, Stock Dividend	$ 733
Adjustments to Additional Paid in Capital, Stock Split	$ 733