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, 2014	Dec. 31, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 4,165	$ 4,212
Realized gain (loss)	101	42
Change in unrealized gain (loss)	(68)	185
Purchases, sales and settlements, net	(425)	(278)
Transfers (out) in of Level 3	(8)	4
Ending balance	3,765	4,165
U.S. Equity Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	27	18
Realized gain (loss)	(5)	0
Change in unrealized gain (loss)	(14)	5
Purchases, sales and settlements, net	24	6
Transfers (out) in of Level 3	(3)	(2)
Ending balance	29	27
Non-U.S. Equity Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	3	0
Realized gain (loss)	0	0
Change in unrealized gain (loss)	(2)	1
Purchases, sales and settlements, net	3	1
Transfers (out) in of Level 3	0	1
Ending balance	4	3
Debt - corporate issued [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	19	27
Realized gain (loss)	11	0
Change in unrealized gain (loss)	(2)	(8)
Purchases, sales and settlements, net	(10)	(1)
Transfers (out) in of Level 3	(3)	1
Ending balance	15	19
Debt - Asset-backed [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	4	2
Realized gain (loss)	0	0
Change in unrealized gain (loss)	(1)	0
Purchases, sales and settlements, net	0	0
Transfers (out) in of Level 3	(2)	2
Ending balance	1	4
Hedge funds [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	434	387
Realized gain (loss)	12	3
Change in unrealized gain (loss)	8	22
Purchases, sales and settlements, net	(9)	22
Transfers (out) in of Level 3	0	0
Ending balance	445	434
Private market securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	2,572	2,624
Realized gain (loss)	83	39
Change in unrealized gain (loss)	(71)	88
Purchases, sales and settlements, net	(299)	(181)
Transfers (out) in of Level 3	0	2
Ending balance	2,285	2,572
Real Estate [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	1,106	1,154
Realized gain (loss)	0	0
Change in unrealized gain (loss)	14	77
Purchases, sales and settlements, net	(134)	(125)
Transfers (out) in of Level 3	0	0
Ending balance	$ 986	$ 1,106