Consolidated Statement of Comprehensive Income (Parenthetical) (Parentheticals) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Statement of Other Comprehensive Income [Abstract]
Foreign currency translation, tax (expense)/benefit	$ 9	$ 3	$ (73)
Current year actuarial gain (loss), tax (expense)/benefit	372	1,276	214
Amortization of actuarial (gain) loss, tax (expense)/benefit	(243)	(221)	(173)
Current year prior service credit (cost), tax (expense)/benefit	(12)	(51)	3
Amortization of prior service (credit) cost, tax (expense)/benefit	17	11	12
Amortization of transition (asset) obligation, tax (expense)/benefit	(1)	(1)	(1)
Derivative financial instruments, Gains (losses) deferred, tax (expense)/benefit	29	12	29
Derivative financial instruments, Gains (losses) reclassified to earnings, tax (expense)/benefit	(10)	21	(18)
Available-for-sale securities, Gains (losses) deferred, tax (expense)/benefit	(13)	2	(25)
Available-for-sale securities, (Gains) losses reclassifed to earnings, tax (expense)/benefit	$ 1	$ (1)	$ 2

Tax effect of the income statement impact of the reclassification adjustment for prior service costs recognized as a component of net period benefit cost.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 130

-Paragraph 25

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Paragraph 38

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

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Tax effect of unrealized holding gain (loss) before reclassification adjustments and transfers on available-for-sale securities.

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