Changes in Shareholders' Equity (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 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	59	51	120	106
Decrease (increase) in net actuarial losses, net of tax	27	27	124	25
Deferred derivative gains (losses), net of tax	2	10	6	2
Reclassification adjustment for amounts recognized in income, net of tax	1	(1)	1	(2)
Total comprehensive income (loss)	2	(24)	(13)	16
Balance at end of period	520		520
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	3	2	7	4
Tax on decrease (increase) in net actuarial losses	2	7	2	7
Tax on deferred derivative gains	1	0	1	0
Tax on reclassification adjustment for amounts recognized in income	1	(2)	1	(2)
Non-Controlling Interest, Redeemable
Balance at beginning of period	515	626	534	607
Changes in Minority Equity presented outside of Shareholders' Equity
Net income (loss)	(5)	1	(13)	5
Foreign currency translation, net of tax	7	(29)	(8)	(12)
Amortization of prior service cost and unrecognized gains and losses included in total benefit cost, net of tax	2	1	4	3
Decrease (increase) in net actuarial losses, net of tax	1	1	2	0
Deferred derivative gains (losses), net of tax	0	3	1	0
Reclassification adjustment for amounts recognized in income, net of tax	0	(1)	0	(1)
Other comprehensive income (loss)	10	(25)	(1)	(10)
Total comprehensive income (loss)	5	(24)	(14)	(5)
Balance at end of period	520	602	520	602
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 deferred derivative gains	0	0	0	0
Tax on reclassification adjustment for amounts recognized in income	$ 0	$ 0	$ 0	$ 0