Changes in Shareholders' Equity (Details 1) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 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	$ 19	$ 25	56	$ 82
Decrease (increase) in net actuarial losses, net of tax	0	6	24	30
Immediate recognition of prior service cost and unrecognized gains and losses due to curtailments, settlements, and divestitures, net of tax	0	1	2	43
Deferred derivative gains (losses), net of tax	6	11	16	10
Reclassification adjustment for amounts recognized in income, net of tax of $0 and ($2) in 2015 ($0 and $0 in 2014)	(8)	0	(21)	1
Total comprehensive income (loss)	15	(13)	0	38
Balance at end of period	590		590
Changes in Minority Equity presented outside of Shareholders' Equity (Textuals) [Abstract]
Tax on foreign currency translation	(18)	0	(42)	0
Tax on amortization of prior service cost and unrecognized gains and losses included in total benefit cost	9	2	27	5
Tax on decrease (increase) in net actuarial losses	0	0	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 prior service credit from plan amendments	0	0	0	0
Tax on deferred derivative gains (losses)	1	1	3	0
Tax on unrealized investment gains (losses)	0	0	1	0
Tax on reclassification adjustment for amounts recognized in income	0	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			53	79
Decrease (increase) in net actuarial losses, net of tax			22	18
Immediate recognition of prior service cost and unrecognized gains and losses due to curtailments, settlements, and divestitures, net of tax			2	39
Deferred derivative gains (losses), net of tax			14	8
Reclassification adjustment for amounts recognized in income, net of tax of $0 and ($2) in 2015 ($0 and $0 in 2014)			(17)	1
Dividends declared to minority shareholders			(8)	(15)
Changes in Minority Equity presented outside of Shareholders' Equity (Textuals) [Abstract]
Tax on foreign currency translation			(42)	0
Tax on amortization of prior service cost and unrecognized gains and losses included in total benefit cost			27	5
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 prior service credit from plan amendments			0	0
Tax on deferred derivative gains (losses)			3	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	569	613	582	577
Comprehensive income (loss):
Net income	27	31	43	50
Foreign currency translation, net of tax	(6)	(41)	(38)	(43)
Amortization of prior service cost and unrecognized gains and losses included in total benefit cost, net of tax	1	1	3	3
Decrease (increase) in net actuarial losses, net of tax	0	0	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	2	2	2
Reclassification adjustment for amounts recognized in income, net of tax of $0 and ($2) in 2015 ($0 and $0 in 2014)	(2)	(1)	(4)	0
Other comprehensive income (loss)	(6)	(39)	(35)	(22)
Total comprehensive income (loss)	21	(8)	8	28
Dividends declared to minority shareholders	0	(10)	0	(10)
Balance at end of period	590	595	590	595
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	(1)	0	(1)
Tax on reclassification adjustment for amounts recognized in income	$ 0	$ 0	$ 0	$ 0