Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Net income before non-controlling interests	$ 1,497us-gaap_ProfitLoss	$ 1,385us-gaap_ProfitLoss	$ 1,201us-gaap_ProfitLoss
Other comprehensive income (loss), before tax:
Foreign currency translation adjustments	(527)	(86)	177
Unrealized investment loss	0	1	(1)
(Loss) gain related to pension/post-retirement plans	(1,085)	1,213	(447)
Other comprehensive (loss) income, before tax	(1,612)	1,128	(271)
Income tax (credit) expense on other comprehensive loss	(386)us-gaap_OtherComprehensiveIncomeLossTax	442us-gaap_OtherComprehensiveIncomeLossTax	(152)us-gaap_OtherComprehensiveIncomeLossTax
Other comprehensive (loss) income, net of tax	(1,226)	686	(119)
Comprehensive income	271	2,071	1,082
Less: Comprehensive income attributable to non-controlling interests	32	28	25
Comprehensive income attributable to the Company	$ 239us-gaap_ComprehensiveIncomeNetOfTax	$ 2,043us-gaap_ComprehensiveIncomeNetOfTax	$ 1,057us-gaap_ComprehensiveIncomeNetOfTax

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount before tax, after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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