Long-Term Employee Benefits (Schedule of Fair Value of Plan Assets Held in Level 3) (Details) (Level 3 Inputs [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 3,920	$ 2,928
Realized gain / (loss)	11	(9)
Change in unrealized gain / (loss)	201	206
Purchases, sales and settlements	375	884
Transfers out of Level 3	(7)	(89)
Ending balance	4,500	3,920
U.S. Equity Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	20	4
Realized gain / (loss)	0	0
Change in unrealized gain / (loss)	(3)	3
Purchases, sales and settlements	10	13
Transfers out of Level 3	1	0
Ending balance	28	20
Debt - corporate issued [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	34	51
Realized gain / (loss)	(10)	(53)
Change in unrealized gain / (loss)	9	48
Purchases, sales and settlements	5	(11)
Transfers out of Level 3	(8)	(1)
Ending balance	30	34
Debt - Asset-backed [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	4	8
Realized gain / (loss)	0	5
Change in unrealized gain / (loss)	0	(5)
Purchases, sales and settlements	0	(4)
Transfers out of Level 3	0	0
Ending balance	4	4
Hedge funds [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	0	0
Realized gain / (loss)	0	0
Change in unrealized gain / (loss)	(9)	0
Purchases, sales and settlements	401	0
Transfers out of Level 3	0	0
Ending balance	392	0
Private market securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	2,931	1,980
Realized gain / (loss)	21	39
Change in unrealized gain / (loss)	124	229
Purchases, sales and settlements	(117)	683
Transfers out of Level 3	0	0
Ending balance	2,959	2,931
Real Estate [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	931	885
Realized gain / (loss)	0	0
Change in unrealized gain / (loss)	80	(69)
Purchases, sales and settlements	76	203
Transfers out of Level 3	0	(88)
Ending balance	$ 1,087	$ 931