Changes in Shareholders' Equity (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Balance at beginning of period			$ 534
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	54	52	174	158
Decrease (increase) in net actuarial losses, net of tax	0	(12)	124	13
Immediate recognition of prior service cost and unrecognized gains and losses due to curtailments, settlements, and divestitures, net of tax	1	9	2	9
Prior service credit (cost) from plan amendments, net of tax	0	77	0	73
Deferred derivative gains (losses), net of tax	(5)	(4)	1	(2)
Reclassification adjustment for amounts recognized in income, net of tax	1	(5)	2	(7)
Total comprehensive income (loss)	41	36	28	52
Balance at end of period	540		540
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	(1)	(2)	(8)	(6)
Tax on decrease (increase) in net actuarial losses	0	0	2	7
Tax on immediate recognition of prior service cost and unrecognized gains and losses due to curtailments, settlements and divestitures	0	0	0	0
Tax on prior service credit (cost) from plan amendments	0	5	0	3
Tax on deferred derivative gains (losses)	0	0	1	0
Tax on reclassification adjustment for amounts recognized in income	0	(1)	1	(3)
Non-Controlling Interest, Redeemable
Balance at beginning of period	520	602	534	607
Changes in Minority Equity presented outside of Shareholders' Equity
Net income (loss)	12	8	(1)	13
Foreign currency translation, net of tax	18	13	10	1
Amortization of prior service cost and unrecognized gains and losses included in total benefit cost, net of tax	2	1	6	4
Decrease (increase) in net actuarial losses, net of tax	0	(2)	2	(2)
Immediate recognition of prior service cost and unrecognized gains and losses due to curtailments, settlements, and divestitures, net of tax	0	2	0	2
Prior service credit (cost) from plan amendments, net of tax	0	1	0	1
Deferred derivative gains (losses), net of tax	(1)	(1)	0	(1)
Reclassification adjustment for amounts recognized in income, net of tax	0	(2)	0	(3)
Other comprehensive income (loss)	19	12	18	2
Total comprehensive income (loss)	31	20	17	15
Dividends declared to minority shareholders	(11)	(4)	(11)	(4)
Balance at end of period	540	618	540	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	0	0	0	0
Tax on decrease (increase) in net actuarial losses	0	0	0	0
Tax on immediate recognition of prior service cost and unrecognized gains and losses due to curtailments, settlements and divestitures	0	0	0	0
Tax on prior service credit (cost) 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