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Pensions And Other Postretirement Benefits Assets and Fair Value Measurements (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
US Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	$ 46,329	$ 46,013
Plan assets measured at net asset value	14,155	14,678
Other plan assets (liabilities), net	1,138	381
Net Plan Assets	61,622	61,072	$ 65,823
US Pension Plans [Member] | Common and preferred stocks [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	8,326	7,663
US Pension Plans [Member] | Government and agency debt securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	11,374	14,318
US Pension Plans [Member] | Corporate and Other Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	25,452	22,964
US Pension Plans [Member] | Other investments, net [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	1,177	1,068
US Pension Plans [Member] | Investment funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at net asset value	6,509	6,321
US Pension Plans [Member] | Private Equity and Debt Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at net asset value	4,012	4,529
US Pension Plans [Member] | Real estate investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at net asset value	3,634	3,828
US Pension Plans [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	8,774	8,103
US Pension Plans [Member] | Level 1 [Member] | Common and preferred stocks [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	8,288	7,637
US Pension Plans [Member] | Level 1 [Member] | Government and agency debt securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	0	0
US Pension Plans [Member] | Level 1 [Member] | Corporate and Other Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	0	0
US Pension Plans [Member] | Level 1 [Member] | Other investments, net [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	486	466
US Pension Plans [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	37,149	37,429
US Pension Plans [Member] | Level 2 [Member] | Common and preferred stocks [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	35	18
US Pension Plans [Member] | Level 2 [Member] | Government and agency debt securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	11,374	14,318
US Pension Plans [Member] | Level 2 [Member] | Corporate and Other Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	25,452	22,963
US Pension Plans [Member] | Level 2 [Member] | Other investments, net [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	288	130
US Pension Plans [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	406	481
US Pension Plans [Member] | Level 3 [Member] | Common and preferred stocks [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	3	8
US Pension Plans [Member] | Level 3 [Member] | Government and agency debt securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	0	0
US Pension Plans [Member] | Level 3 [Member] | Corporate and Other Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	0	1
US Pension Plans [Member] | Level 3 [Member] | Other investments, net [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	403	472
Non-US Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	7,040	7,029
Plan assets measured at net asset value	6,087	6,099
Other plan assets (liabilities), net	(129)	(138)
Net Plan Assets	12,998	12,990	$ 14,669
Non-US Pension Plans [Member] | Common and preferred stocks [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	987	1,081
Non-US Pension Plans [Member] | Government and agency debt securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	3,222	3,258
Non-US Pension Plans [Member] | Corporate and Other Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	2,047	1,954
Non-US Pension Plans [Member] | Other investments, net [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	784	736
Non-US Pension Plans [Member] | Investment funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at net asset value	4,449	4,475
Non-US Pension Plans [Member] | Private Equity and Debt Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at net asset value	546	529
Non-US Pension Plans [Member] | Real estate investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at net asset value	1,092	1,095
Non-US Pension Plans [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	1,021	1,126
Non-US Pension Plans [Member] | Level 1 [Member] | Common and preferred stocks [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	984	1,079
Non-US Pension Plans [Member] | Level 1 [Member] | Government and agency debt securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	0	0
Non-US Pension Plans [Member] | Level 1 [Member] | Corporate and Other Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	0	0
Non-US Pension Plans [Member] | Level 1 [Member] | Other investments, net [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	37	47
Non-US Pension Plans [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	5,421	5,259
Non-US Pension Plans [Member] | Level 2 [Member] | Common and preferred stocks [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	3	1
Non-US Pension Plans [Member] | Level 2 [Member] | Government and agency debt securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	3,222	3,258
Non-US Pension Plans [Member] | Level 2 [Member] | Corporate and Other Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	2,044	1,953
Non-US Pension Plans [Member] | Level 2 [Member] | Other investments, net [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	152	47
Non-US Pension Plans [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	598	644
Non-US Pension Plans [Member] | Level 3 [Member] | Common and preferred stocks [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	0	1
Non-US Pension Plans [Member] | Level 3 [Member] | Government and agency debt securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	0	0
Non-US Pension Plans [Member] | Level 3 [Member] | Corporate and Other Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	3	1
Non-US Pension Plans [Member] | Level 3 [Member] | Other investments, net [Member]
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	$ 595	$ 642

X

- Definition

Other plan assets and liabilities including, cash held by the plans, net of amounts receivable/payable for unsettled security transactions and payable for investment manager fees, custody fees and other expenses.

+ References

No definition available.

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- Definition

Represents the fair value of plan assets using net asset value. Excludes plan assets and liabilities not measured at fair value.

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- Definition

Represents the fair value of plan assets (net of liabilities other than for benefits) measured on a recurring basis using the fair value hierarchy. Excludes plan assets and liabilities not measured at fair value.

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- Definition

Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 30
-Section 35
-Paragraph 50
-URI http://asc.fasb.org/extlink&oid=64937038&loc=d3e12355-114930

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Plan Assets
-URI http://asc.fasb.org/extlink&oid=6749337

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Plan Assets
-URI http://asc.fasb.org/extlink&oid=6520858

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