Subsequent Events (Unaudited) (Tables)

6 Months Ended

Jun. 30, 2013

Subsequent Events [Abstract]

Schedule of Subsequent Events [Table Text Block]

A summary of the conversion activity follows (in millions):

	4%		8%			5.75%
	Senior		Preferred			Preferred
	Notes		Stock			Stock
Acquisition-date (June 3, 2013) fair value	$	237	$	30		$	229
Less July 2013 conversions	26		—			29
Less June 2013 conversions	211		29		a	200		a
Remaining balance at make-whole expiration dates	$	—	$	1		$	—
Royalty trust units issued upon conversions:
July 2013 conversions	1.8		—			2.0
June 2013 conversions	14.5		2.0		a	13.7		a
Total	16.3		2.0			15.7

a. Conversions of preferred stock in June 2013 included cash consideration of $202 million and royalty trust units with a value of $27 million.