Changes in Shareholders' Equity (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Balance at beginning of period			$ 607
Changes in Minority Equity presented outside of Shareholders' Equity
Amortization of prior service cost and unrecognized gains and losses included in total benefit cost, net of tax	52	42	158	125
Decrease (increase) in net actuarial losses, net of tax	(12)	(4)	13	0
Immediate recognition of prior service cost and unrecognized gains and losses due to curtailments, settlements and divestitures, net of tax	9	4	9	17
Prior service credit from plan amendments, net of tax	77	0	73	0
Deferred derivative (losses) gains, net of tax	(4)	14	(2)	0
Reclassification adjustment for amounts recognized in income, net of tax	(5)	7	(7)	9
Total comprehensive income (loss)	(36)	19	(52)	(60)
Balance at end of period	618		618
Changes in Minority Equity presented outside of Shareholders' Equity (Textuals) [Abstract]
Tax on foreign currency translation	0	0	0	0
Tax on amortization of prior service cost and unrecognized gains and losses included in total benefit cost	2	0	6	2
Tax on net actuarial losses	0	0	7	1
Tax on immediate recognition of prior service costs and unrecognized gains and losses due to curtailments, settlements and divestitures	0	0	0	1
Tax on prior service credit from plan amendments	5	0	3	0
Tax on deferred derivative gains (losses)	0	0	0	0
Tax on reclassification adjustment for amounts recognized in income	(1)	0	(3)	0
Non-Controlling Interest, Redeemable
Balance at beginning of period	602	638	607	584
Changes in Minority Equity presented outside of Shareholders' Equity
Net income	8	24	13	35
Foreign currency translation, net of tax	13	(41)	1	2
Amortization of prior service cost and unrecognized gains and losses included in total benefit cost, net of tax	1	1	4	3
Decrease (increase) in net actuarial losses, net of tax	(2)	0	(2)	1
Immediate recognition of prior service cost and unrecognized gains and losses due to curtailments, settlements and divestitures, net of tax	2	0	2	0
Prior service credit from plan amendments, net of tax	1	0	1	0
Deferred derivative (losses) gains, net of tax	(1)	3	(1)	0
Reclassification adjustment for amounts recognized in income, net of tax	(2)	1	(3)	1
Total comprehensive income (loss)	20	(12)	15	42
Dividends declared to minority shareholders	(4)	0	(4)	0
Balance at end of period	618	626	618	626
Changes in Minority Equity presented outside of Shareholders' Equity (Textuals) [Abstract]
Tax on foreign currency translation	0	0	0	0
Tax on amortization of prior service cost and unrecognized gains and losses included in total benefit cost	0	0	0	0
Tax on net actuarial losses	0	0	0	0
Tax on immediate recognition of prior service costs and unrecognized gains and losses due to curtailments, settlements and divestitures	0	0	0	0
Tax on prior service credit from plan amendments	0	0	0	0
Tax on deferred derivative gains (losses)	0	0	0	0
Tax on reclassification adjustment for amounts recognized in income	$ 0	$ 0	$ 0	$ 0