Pension Plans (Tables)

6 Months Ended

Jun. 30, 2011

Pension Plans (Tables) [Abstract]

Components of the net periodic benefit cost

	Three months ended June 30,
	UK Pension						US Pension						Intl Pension
	Benefits						Benefits						Benefits
	2011			2010			2011			2010			2011			2010
	(millions)
Components of net periodic benefit cost:
Service cost	$	10		$	9		$	—		$	—		$	1		$	2
Interest cost		27			24			11			10			2			2
Expected return on plan assets		(41	)		(33	)		(12	)		(10	)		(2	)		(2	)
Amortization of unrecognized prior service gain		(1	)		(1	)		—			—			—			—
Amortization of unrecognized actuarial loss		7			9			1			—			—			1
Net periodic benefit cost	$	2		$	8		$	—		$	—		$	1		$	3

	Six months ended June 30,
	UK Pension						US Pension						Intl Pension
	Benefits						Benefits						Benefits
	2011			2010			2011			2010			2011			2010
	(millions)
Components of net periodic benefit cost:
Service cost	$	19		$	18		$	—		$	—		$	2		$	3
Interest cost		53			49			21			20			4			4
Expected return on plan assets		(81	)		(69	)		(23	)		(21	)		(4	)		(4	)
Amortization of unrecognized prior service gain		(2	)		(2	)		—			—			—			—
Amortization of unrecognized actuarial loss		15			18			2			1			—			1
Net periodic benefit cost	$	4		$	14		$	—		$	—		$	2		$	4