Pensions And Other Postretirement Benefits Pension Level 3 Assets rollforward (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
US Pension Plans [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Beginning balance-gross assets	$ 63,852
Beginning balance-net assets	63,513
Net Realized / Unrealized Gains (Losses)	7,346	2,107
Effect of Foreign Currency	0	0
Ending balance-gross assets	65,773	63,852
Ending balance-net assets	65,254	63,513
US Pension Plans [Member] | Level 3 [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Beginning balance-gross assets	15,834
Beginning balance-net assets	15,828	15,950
Net Realized / Unrealized Gains (Losses)	1,136	1,945
Purchases, Sales and Settlements, Net	(2,068)	(2,067)
Transfers Into/Out of Level 3	(6)	0
Ending balance-gross assets	14,890	15,834
Ending balance-net assets	14,890	15,828
Change in Unrealized Gains (Losses) Attributable to Assets Held at Balance Sheet Date	304	1,160
US Pension Plans [Member] | Common and preferred stocks [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Ending balance-gross assets	10,066	10,310
US Pension Plans [Member] | Common and preferred stocks [Member] | Level 3 [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Beginning balance-gross assets	6	19
Net Realized / Unrealized Gains (Losses)	2	3
Purchases, Sales and Settlements, Net	(5)	(16)
Transfers Into/Out of Level 3	0	0
Ending balance-gross assets	3	6
Change in Unrealized Gains (Losses) Attributable to Assets Held at Balance Sheet Date	0	1
US Pension Plans [Member] | Corporate and other debt securities [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Ending balance-gross assets	22,808	20,777
US Pension Plans [Member] | Corporate and other debt securities [Member] | Level 3 [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Beginning balance-gross assets	130	182
Net Realized / Unrealized Gains (Losses)	0	6
Purchases, Sales and Settlements, Net	(41)	(58)
Transfers Into/Out of Level 3	(6)	0
Ending balance-gross assets	83	130
Change in Unrealized Gains (Losses) Attributable to Assets Held at Balance Sheet Date	(4)	(3)
US Pension Plans [Member] | Investment funds [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Ending balance-gross assets	6,201	6,291
US Pension Plans [Member] | Investment funds [Member] | Level 3 [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Beginning balance-gross assets	5,174	4,959
Net Realized / Unrealized Gains (Losses)	231	552
Purchases, Sales and Settlements, Net	(184)	(337)
Transfers Into/Out of Level 3	0	0
Ending balance-gross assets	5,221	5,174
Change in Unrealized Gains (Losses) Attributable to Assets Held at Balance Sheet Date	208	537
US Pension Plans [Member] | Private equity and debt investments [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Ending balance-gross assets	5,909	6,335
US Pension Plans [Member] | Private equity and debt investments [Member] | Level 3 [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Beginning balance-gross assets	6,335	6,400
Net Realized / Unrealized Gains (Losses)	651	926
Purchases, Sales and Settlements, Net	(1,077)	(991)
Transfers Into/Out of Level 3	0	0
Ending balance-gross assets	5,909	6,335
Change in Unrealized Gains (Losses) Attributable to Assets Held at Balance Sheet Date	27	436
US Pension Plans [Member] | Real estate investments [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Ending balance-gross assets	4,170	4,521
US Pension Plans [Member] | Real estate investments [Member] | Level 3 [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Beginning balance-gross assets	4,127	4,335
Net Realized / Unrealized Gains (Losses)	251	458
Purchases, Sales and Settlements, Net	(770)	(666)
Transfers Into/Out of Level 3	0	0
Ending balance-gross assets	3,608	4,127
Change in Unrealized Gains (Losses) Attributable to Assets Held at Balance Sheet Date	68	190
US Pension Plans [Member] | Other investments [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Ending balance-gross assets	65	62
US Pension Plans [Member] | Other investments [Member] | Level 3 [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Beginning balance-gross assets	62	63
Net Realized / Unrealized Gains (Losses)	5	(2)
Purchases, Sales and Settlements, Net	(2)	1
Transfers Into/Out of Level 3	0	0
Ending balance-gross assets	65	62
Change in Unrealized Gains (Losses) Attributable to Assets Held at Balance Sheet Date	5	(2)
US Pension Plans [Member] | Derivatives [Member] | Level 3 [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Beginning balance-net assets	(6)	(8)
Net Realized / Unrealized Gains (Losses)	(4)	2
Purchases, Sales and Settlements, Net	11	0
Transfers Into/Out of Level 3	0	0
Ending balance-net assets	1	(6)
Change in Unrealized Gains (Losses) Attributable to Assets Held at Balance Sheet Date	0	1
Non-US Pension Plans [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Beginning balance-gross assets	14,812
Beginning balance-net assets	14,744
Net Realized / Unrealized Gains (Losses)	1,893	988
Effect of Foreign Currency	(1,232)	(692)
Ending balance-gross assets	14,727	14,812
Ending balance-net assets	14,683	14,744
Non-US Pension Plans [Member] | Level 3 [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Ending balance-gross assets	3,383	3,212
Ending balance-net assets	3,383	3,212
Non-US Pension Plans [Member] | Common and preferred stocks [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Ending balance-gross assets	1,962	1,822
Non-US Pension Plans [Member] | Common and preferred stocks [Member] | Level 3 [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Ending balance-gross assets	0	0
Non-US Pension Plans [Member] | Corporate and other debt securities [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Ending balance-gross assets	1,986	2,489
Non-US Pension Plans [Member] | Corporate and other debt securities [Member] | Level 3 [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Beginning balance-gross assets	14	5
Net Realized / Unrealized Gains (Losses)	0	1
Purchases, Sales and Settlements, Net	(13)	7
Transfers Into/Out of Level 3	0	1
Effect of Foreign Currency	(1)	0
Ending balance-gross assets	0	14
Change in Unrealized Gains (Losses) Attributable to Assets Held at Balance Sheet Date	0	1
Non-US Pension Plans [Member] | Investment funds [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Ending balance-gross assets	4,399	4,402
Non-US Pension Plans [Member] | Investment funds [Member] | Level 3 [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Beginning balance-gross assets	745	641
Net Realized / Unrealized Gains (Losses)	103	110
Purchases, Sales and Settlements, Net	111	27
Transfers Into/Out of Level 3	0	0
Effect of Foreign Currency	(70)	(33)
Ending balance-gross assets	889	745
Change in Unrealized Gains (Losses) Attributable to Assets Held at Balance Sheet Date	103	112
Non-US Pension Plans [Member] | Private equity and debt investments [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Ending balance-gross assets	509	430
Non-US Pension Plans [Member] | Private equity and debt investments [Member] | Level 3 [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Beginning balance-gross assets	430	381
Net Realized / Unrealized Gains (Losses)	100	73
Purchases, Sales and Settlements, Net	20	3
Transfers Into/Out of Level 3	0	0
Effect of Foreign Currency	(41)	(27)
Ending balance-gross assets	509	430
Change in Unrealized Gains (Losses) Attributable to Assets Held at Balance Sheet Date	75	53
Non-US Pension Plans [Member] | Real estate investments [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Ending balance-gross assets	1,287	1,430
Non-US Pension Plans [Member] | Real estate investments [Member] | Level 3 [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Beginning balance-gross assets	1,405	1,422
Net Realized / Unrealized Gains (Losses)	48	103
Purchases, Sales and Settlements, Net	(84)	(57)
Transfers Into/Out of Level 3	0	0
Effect of Foreign Currency	(106)	(63)
Ending balance-gross assets	1,263	1,405
Change in Unrealized Gains (Losses) Attributable to Assets Held at Balance Sheet Date	44	122
Non-US Pension Plans [Member] | Other investments [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Ending balance-gross assets	722	618
Non-US Pension Plans [Member] | Other investments [Member] | Level 3 [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Beginning balance-gross assets	618	665
Net Realized / Unrealized Gains (Losses)	92	(10)
Purchases, Sales and Settlements, Net	72	(43)
Transfers Into/Out of Level 3	0	0
Effect of Foreign Currency	(60)	6
Ending balance-gross assets	722	618
Change in Unrealized Gains (Losses) Attributable to Assets Held at Balance Sheet Date	76	4
Non-US Pension Plans [Member] | Total assets [Member] | Level 3 [Member]
Pension Level 3 Assets Reconciliation [Roll Forward]
Beginning balance-gross assets	3,212	3,114
Net Realized / Unrealized Gains (Losses)	343	277
Purchases, Sales and Settlements, Net	106	(63)
Transfers Into/Out of Level 3	0	1
Effect of Foreign Currency	(278)	(117)
Ending balance-gross assets	3,383	3,212
Change in Unrealized Gains (Losses) Attributable to Assets Held at Balance Sheet Date	$ 298	$ 292