Changes in Shareholders' Equity (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Changes in Minority Equity presented outside of Shareholders' Equity
Balance at beginning of period	$ 582
Amortization of prior service cost and unrecognized gains and losses included in total benefit cost, net of tax	19	32
Decrease (increase) in net actuarial losses, net of tax	0	19
Immediate recognition of prior service cost and unrecognized gains and losses due to curtailments, settlements, and divestitures, net of tax	0	42
Deferred derivative gains (losses), net of tax	13	(2)
Reclassification adjustment for amounts recognized in income, net of tax	(4)	1
Total comprehensive income (loss)	(50)	29
Balance at end of period	539
Changes in Minority Equity presented outside of Shareholders' Equity (Textuals) [Abstract]
Tax on foreign currency translation	(34)	0
Tax on amortization of prior service cost and unrecognized gains and losses included in total benefit cost	9	2
Tax on decrease (increase) in net actuarial losses	0	0
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	0
Tax on reclassification adjustment for amounts recognized in income	(1)	0
Tax on unrealized investment gains (losses)	4	0
Parent and Non-Redeemable Non-Controlling Interest
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	18	31
Decrease (increase) in net actuarial losses, net of tax	0	8
Immediate recognition of prior service cost and unrecognized gains and losses due to curtailments, settlements, and divestitures, net of tax	0	38
Deferred derivative gains (losses), net of tax	11	(2)
Reclassification adjustment for amounts recognized in income, net of tax	(4)	1
Dividends declared to minority shareholders	(1)	(7)
Changes in Minority Equity presented outside of Shareholders' Equity (Textuals) [Abstract]
Tax on foreign currency translation	(34)	0
Tax on amortization of prior service cost and unrecognized gains and losses included in total benefit cost	9	2
Tax on decrease (increase) in net actuarial losses	0	0
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	0
Tax on reclassification adjustment for amounts recognized in income	(1)	0
Tax on unrealized investment gains (losses)	4	0
Minority Shareholders' Equity - Redeemable
Changes in Minority Equity presented outside of Shareholders' Equity
Balance at beginning of period	582	577
Net income (loss)	9	6
Foreign currency translation, net of tax	(55)	1
Amortization of prior service cost and unrecognized gains and losses included in total benefit cost, net of tax	1	1
Decrease (increase) in net actuarial losses, net of tax	0	11
Immediate recognition of prior service cost and unrecognized gains and losses due to curtailments, settlements, and divestitures, net of tax	0	4
Deferred derivative gains (losses), net of tax	2	0
Other comprehensive income (loss)	(52)	17
Total comprehensive income (loss)	(43)	23
Balance at end of period	539	600
Changes in Minority Equity presented outside of Shareholders' Equity (Textuals) [Abstract]
Tax on foreign currency translation	0	0
Tax on amortization of prior service cost and unrecognized gains and losses included in total benefit cost	0	0
Tax on decrease (increase) in net actuarial losses	0	0
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)	$ 0	$ 0