Postretirement Benefit Plans (Details 4) (USD $) In Millions, unless otherwise specified	2 Months Ended	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010
Change in plan assets
Plan assets - January 1		$ 195
Expenses	(2)	(2)
Plan assets - December 31	195	192	195
Funded status at end of year	(279)	(330)	(279)
U.S. Pension Plans [Member]
Change in plan assets
Plan assets - January 1		185	174
Actual return on plan assets	23	(6)
Employer contributions	2	18
Benefits paid	(12)	(13)	(12)
Expenses	(2)	(2)
Plan assets - December 31	185	182	185
Funded status at end of year	(61)	(96)	(61)
Pension [Member]
Change in plan assets
Plan assets - January 1		187	176
Actual return on plan assets	23	(6)
Employer contributions	5	21
Benefits paid	(14)	(16)	(14)
Plan assets - December 31	187	184	187
Funded status at end of year	(112)	(146)	(112)
International Pension Plan [Member]
Change in plan assets
Plan assets - January 1		2	2
Actual return on plan assets	0	0
Employer contributions	3	3
Benefits paid	(2)	(3)	(2)
Expenses	0
Plan assets - December 31	2	2	2
Funded status at end of year	$ (51)	$ (50)	$ (51)