Long-Term Employee Benefits (Schedule of Fair Value of Plan Assets Held in Level 3) (Details) - Level 3 Inputs [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 3,199	$ 3,598
Realized gain (loss)	(77)	92
Change in unrealized (loss) gain	(48)	(90)
Purchases, sales and settlements, net	(410)	(393)
Transfers (out) in of Level 3	13	(8)
Ending balance	2,677	3,199
U.S. Equity Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	29	27
Realized gain (loss)	(14)	(5)
Change in unrealized (loss) gain	5	(14)
Purchases, sales and settlements, net	0	24
Transfers (out) in of Level 3	0	(3)
Ending balance	20	29
Non-U.S. Equity Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	4	3
Realized gain (loss)	0	0
Change in unrealized (loss) gain	(3)	(2)
Purchases, sales and settlements, net	0	3
Transfers (out) in of Level 3	1	0
Ending balance	2	4
Debt - corporate issued [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	15	19
Realized gain (loss)	(18)	11
Change in unrealized (loss) gain	15	(2)
Purchases, sales and settlements, net	10	(10)
Transfers (out) in of Level 3	12	(3)
Ending balance	34	15
Debt - Asset-backed [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	1	4
Realized gain (loss)	0	0
Change in unrealized (loss) gain	0	(1)
Purchases, sales and settlements, net	0	0
Transfers (out) in of Level 3	0	(2)
Ending balance	1	1
Hedge funds [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	445	434
Realized gain (loss)	9	12
Change in unrealized (loss) gain	(2)	8
Purchases, sales and settlements, net	(23)	(9)
Transfers (out) in of Level 3	0	0
Ending balance	429	445
Private market securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	1,719	2,005
Realized gain (loss)	15	74
Change in unrealized (loss) gain	(39)	(93)
Purchases, sales and settlements, net	(105)	(267)
Transfers (out) in of Level 3	0	0
Ending balance	1,590	1,719
Real Estate [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	986	1,106
Realized gain (loss)	(69)	0
Change in unrealized (loss) gain	(24)	14
Purchases, sales and settlements, net	(292)	(134)
Transfers (out) in of Level 3	0	0
Ending balance	$ 601	$ 986