Schedule I Condensed Financial Information Parent Company Statements of Shareholders' Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Preferred Stock, Shares, Beginning Balance	10,000,000
Common Stock, Shares, Beginning Balance	248,000,000
Total Shareholders’ Equity, Beginning Balance	$ 1,606
Comprehensive income (loss): [Abstract]
Net Income	2,452	629	212
Foreign currency translation (net of tax)	(298)	(151)	83
Reclassification adjustment for amounts recognized in income (net of tax)	3	1	0
Amortization of prior service cost and unrecognized gains and losses included in total benefit cost (net of tax)	79	232	209
Decrease (increase) in net actuarial losses (net of tax)	(82)	519	(979)
Immediate recognition of prior service cost and unrecognized gains and losses due to curtailments, settlements and divestitures (net of tax)	35	2	11
Prior service credit (cost) from plan amendments (net of tax)	0	31	73
Deferred derivative gains (losses) (net of tax)	16	1	(5)
Reclassification adjustment for amounts recognized in income (net of tax)	1	2	(11)
Unrealized investment gains (net of tax)	2	8	0
Other comprehensive income (loss)	(244)	645	(619)
Total comprhensive income (loss)	2,257	1,242	(362)
Preferred Stock, Shares, Ending Balance	0	10,000,000
Common Stock, Shares, Ending Balance	269,000,000	248,000,000
Total Shareholders’ Equity, Ending Balance	3,610	1,606
Parent Company
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Preferred Stock, Shares, Beginning Balance	10,000,000
Common Stock, Shares, Beginning Balance	248,000,000
Total Shareholders’ Equity, Beginning Balance	1,606	370	749
Comprehensive income (loss): [Abstract]
Net Income	2,452	629	212
Other comprehensive income (loss)	(195)	613	(574)
Total comprhensive income (loss)	2,257	1,242	(362)
Purchase of subsidiary shares from minority interest	(5)	(2)	(8)
Stock-based compensation plans	20	15	17
Repurchase of common stock	(234)
Preferred stock dividends declared			(29)
Dividends declared	(67)	(41)
Common stock issued from treasury	33	22	3
Preferred stock conversion	0
Preferred Stock, Shares, Ending Balance		10,000,000
Common Stock, Shares, Ending Balance	269,000,000	248,000,000
Total Shareholders’ Equity, Ending Balance	3,610	1,606	370
Preferred Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Preferred Stock, Shares, Beginning Balance				10,000,000
Comprehensive income (loss): [Abstract]
Preferred Stock, Shares, Ending Balance	0	10,000,000	10,000,000	10,000,000
Preferred Stock | Parent Company
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Preferred Stock, Shares, Beginning Balance	10,000,000			10,000,000
Total Shareholders’ Equity, Beginning Balance	500			500
Comprehensive income (loss): [Abstract]
Preferred stock conversion (shares)	(10,000,000)
Preferred stock conversion	(500)
Preferred Stock, Shares, Ending Balance	0		10,000,000	10,000,000
Total Shareholders’ Equity, Ending Balance	0		500	500
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Shares, Beginning Balance	247,753,029	245,240,762	244,535,841
Comprehensive income (loss): [Abstract]
Common stock issued from treasury (shares)	3,111,843	2,512,267	704,921
Common stock issued from treasury	2	3	0
Common Stock, Shares, Ending Balance	269,483,500	247,753,029	245,240,762
Common Stock | Parent Company
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Shares, Beginning Balance	247,753,029	245,240,762	244,535,841
Total Shareholders’ Equity, Beginning Balance	248	245	245
Comprehensive income (loss): [Abstract]
Repurchase of common stock (shares)	(8,955,107)
Repurchase of common stock	(9)
Common stock issued from treasury (shares)	3,111,843	2,512,267	704,921
Common stock issued from treasury	2	3	0
Preferred stock conversion (shares)	27,573,735
Preferred stock conversion	28
Common Stock, Shares, Ending Balance	269,483,500	247,753,029	245,240,762
Total Shareholders’ Equity, Ending Balance	269	248	245
Capital Surplus
Comprehensive income (loss): [Abstract]
Purchase of subsidiary shares from minority interest	(4)	(2)	(13)
Stock-based compensation plans	20	15	17
Common stock issued from treasury	31	19	3
Capital Surplus | Parent Company
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total Shareholders’ Equity, Beginning Balance	2,847	2,815	2,808
Comprehensive income (loss): [Abstract]
Purchase of subsidiary shares from minority interest	(4)	(2)	(13)
Stock-based compensation plans	20	15	17
Repurchase of common stock	(225)
Common stock issued from treasury	31	19	3
Preferred stock conversion	472
Total Shareholders’ Equity, Ending Balance	3,141	2,847	2,815
Retained Earnings
Comprehensive income (loss): [Abstract]
Preferred stock dividends declared			(29)
Dividends declared	(67)	(41)
Retained Earnings | Parent Company
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total Shareholders’ Equity, Beginning Balance	1,958	1,370	1,187
Comprehensive income (loss): [Abstract]
Net Income	2,452	629	212
Preferred stock dividends declared			(29)
Dividends declared	(67)	(41)
Total Shareholders’ Equity, Ending Balance	4,343	1,958	1,370
Accumulated Other Comprehensive Loss
Comprehensive income (loss): [Abstract]
Foreign currency translation (net of tax)	(206)	(153)	51
Reclassification adjustment for amounts recognized in income (net of tax)	3	1
Amortization of prior service cost and unrecognized gains and losses included in total benefit cost (net of tax)	74	224	203
Decrease (increase) in net actuarial losses (net of tax)	(112)	498	(898)
Immediate recognition of prior service cost and unrecognized gains and losses due to curtailments, settlements and divestitures (net of tax)	31	2	9
Prior service credit (cost) from plan amendments (net of tax)		30	72
Deferred derivative gains (losses) (net of tax)	13	1	(4)
Reclassification adjustment for amounts recognized in income (net of tax)		2	(7)
Unrealized investment gains (net of tax)	2	8
Purchase of subsidiary shares from minority interest	(1)		5
Accumulated Other Comprehensive Loss | Parent Company
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total Shareholders’ Equity, Beginning Balance	(3,947)	(4,560)	(3,991)
Comprehensive income (loss): [Abstract]
Foreign currency translation (net of tax)	(206)	(153)	51
Reclassification adjustment for amounts recognized in income (net of tax)	3	1
Amortization of prior service cost and unrecognized gains and losses included in total benefit cost (net of tax)	74	224	203
Decrease (increase) in net actuarial losses (net of tax)	(112)	498	(898)
Immediate recognition of prior service cost and unrecognized gains and losses due to curtailments, settlements and divestitures (net of tax)	31	2	9
Prior service credit (cost) from plan amendments (net of tax)		30	72
Deferred derivative gains (losses) (net of tax)	13	1	(4)
Reclassification adjustment for amounts recognized in income (net of tax)		2	(7)
Unrealized investment gains (net of tax)	2	(8)
Purchase of subsidiary shares from minority interest	(1)		5
Total Shareholders’ Equity, Ending Balance	$ (4,143)	$ (3,947)	$ (4,560)