Changes in Shareholders' Equity (Details 1) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Changes in Minority Equity presented outside of Shareholders' Equity
Balance at beginning of period			$ 582
Comprehensive income (loss):
Amortization of prior service cost and unrecognized gains and losses included in total benefit cost, net of tax	$ 18	$ 25	37	$ 57
Decrease (increase) in net actuarial losses, net of tax	24	5	24	24
Immediate recognition of prior service cost and unrecognized gains and losses due to curtailments, settlements, and divestitures, net of tax	2	0	2	42
Deferred derivative gains (losses), net of tax	(3)	1	10	(1)
Reclassification adjustment for amounts recognized in income, net of tax	(9)	0	(13)	1
Total comprehensive income (loss)	35	22	(15)	51
Balance at end of period	569		569
Changes in Minority Equity presented outside of Shareholders' Equity (Textuals) [Abstract]
Tax on foreign currency translation	10	0	(24)	0
Tax on amortization of prior service cost and unrecognized gains and losses included in total benefit cost	9	1	18	3
Tax on decrease (increase) in net actuarial losses	11	3	11	3
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 deferred derivative gains (losses)	0	(1)	2	(1)
Tax on unrealized investment gains (losses)	(3)	0	1	0
Tax on reclassification adjustment for amounts recognized in income	(1)	0	(2)	0
Parent and Non-Redeemable Non-Controlling Interest
Comprehensive income (loss):
Amortization of prior service cost and unrecognized gains and losses included in total benefit cost, net of tax			35	55
Decrease (increase) in net actuarial losses, net of tax			22	12
Immediate recognition of prior service cost and unrecognized gains and losses due to curtailments, settlements, and divestitures, net of tax			2	38
Deferred derivative gains (losses), net of tax			9	(1)
Reclassification adjustment for amounts recognized in income, net of tax			(11)	0
Dividends declared to minority shareholders			(7)	(15)
Changes in Minority Equity presented outside of Shareholders' Equity (Textuals) [Abstract]
Tax on foreign currency translation			(24)	0
Tax on amortization of prior service cost and unrecognized gains and losses included in total benefit cost			18	3
Tax on decrease (increase) in net actuarial losses			11	3
Tax on immediate recognition of prior service cost and unrecognized gains and losses due to curtailments, settlements and divestitures			0	0
Tax on deferred derivative gains (losses)			2	(1)
Tax on unrealized investment gains (losses)			1	0
Tax on reclassification adjustment for amounts recognized in income			(2)	0
Minority Shareholders' Equity - Redeemable
Changes in Minority Equity presented outside of Shareholders' Equity
Balance at beginning of period	539	600	582	577
Comprehensive income (loss):
Net income	7	13	16	19
Foreign currency translation, net of tax	23	(3)	(32)	(2)
Amortization of prior service cost and unrecognized gains and losses included in total benefit cost, net of tax	1	1	2	2
Decrease (increase) in net actuarial losses, net of tax	2	1	2	12
Immediate recognition of prior service cost and unrecognized gains and losses due to curtailments, settlements, and divestitures, net of tax	0	0	0	4
Deferred derivative gains (losses), net of tax	(1)	0	1	0
Reclassification adjustment for amounts recognized in income, net of tax	(2)	1	(2)	1
Other comprehensive income (loss)	23	0	(29)	17
Total comprehensive income (loss)	30	13	(13)	36
Balance at end of period	569	613	569	613
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 deferred derivative gains (losses)	0	0	0	0
Tax on reclassification adjustment for amounts recognized in income	$ 0	$ 0	$ 0	$ 0