Pension and Postretirement Benefit Plans (Details 4) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011
Future Pension and Postretirement Benefit Payments
2012 Benefit Payments, Medicare Subsidy Receipts	$ 10
United States Qualified and Non-qualified Pension Benefits
Future Pension and Postretirement Benefit Payments
2012 Benefit Payments	730
2013 Benefit Payments	752
2014 Benefit Payments	774
2015 Benefit Payments	796
2016 Benefit Payments	818
Following five years	4,407
International Qualified and Non-qualified Pension Benefits
Future Pension and Postretirement Benefit Payments
2012 Benefit Payments	216
2013 Benefit Payments	219
2014 Benefit Payments	233
2015 Benefit Payments	245
2016 Benefit Payments	257
Following five years	1,500
Postretirement Benefits
Future Pension and Postretirement Benefit Payments
2012 Benefit Payments	112
2013 Benefit Payments	122
2014 Benefit Payments	135
2015 Benefit Payments	137
2016 Benefit Payments	152
Following five years	$ 771