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, 2012	Dec. 31, 2011
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 4,500	$ 3,920
Realized gain (loss)	14	11
Change in unrealized gain (loss)	253	201
Purchases, sales and settlements	(134)	375
Transfers (out) in of Level 3	(123)	(7)
Ending balance	4,510	4,500
U.S. Equity Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	28	20
Realized gain (loss)	(3)	0
Change in unrealized gain (loss)	(8)	(3)
Purchases, sales and settlements	(1)	10
Transfers (out) in of Level 3	2	1
Ending balance	18	28
Debt - corporate issued [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	30	34
Realized gain (loss)	0	(10)
Change in unrealized gain (loss)	(10)	9
Purchases, sales and settlements	7	5
Transfers (out) in of Level 3	0	(8)
Ending balance	27	30
Debt - Asset-backed [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	4	4
Realized gain (loss)	0	0
Change in unrealized gain (loss)	0	0
Purchases, sales and settlements	(2)	0
Transfers (out) in of Level 3	0	0
Ending balance	2	4
Hedge funds [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	392	0
Realized gain (loss)	(6)	0
Change in unrealized gain (loss)	17	(9)
Purchases, sales and settlements	(16)	401
Transfers (out) in of Level 3	0	0
Ending balance	387	392
Private market securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	2,959	2,931
Realized gain (loss)	23	21
Change in unrealized gain (loss)	179	124
Purchases, sales and settlements	(114)	(117)
Transfers (out) in of Level 3	(125)	0
Ending balance	2,922	2,959
Real Estate [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	1,087	931
Realized gain (loss)	0	0
Change in unrealized gain (loss)	75	80
Purchases, sales and settlements	(8)	76
Transfers (out) in of Level 3	0	0
Ending balance	$ 1,154	$ 1,087