Debt (Tables)

3 Months Ended

Mar. 31, 2012

Debt [Abstract]

Components of Notes Payable [Table Text Block]

(millions)		March 31, 2012				December 31, 2011
		Principal amount	Effective interest rate			Principal amount	Effective interest rate
U.S. commercial paper	$	32	0.25	%	$	216	0.24	%
Bank borrowings		27				18
Total	$	59			$	234