Postretirement Plans (Reconciliation Of Level 3 Assets Held) (Details) (Pension Plans [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance at fair value	$ 56,178		$ 51,051
Net Realized and Unrealized Gains/(Losses)	3,316		6,300
Net Purchases, Issuances and Settlements	(103)		(71)
Ending balance at fair value	58,131		56,178
Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance at fair value	7,745		7,777
Net Realized and Unrealized Gains/(Losses)	1,066		519
Net Purchases, Issuances and Settlements	(870)		310
Net Transfers Into/(Out of) Level 3	85		(861)
Ending balance at fair value	8,026		7,745
Fixed Income Securities [Member] | Corporate [Member] | Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance at fair value	3		11
Net Realized and Unrealized Gains/(Losses)			(12)
Net Purchases, Issuances and Settlements	16		11
Net Transfers Into/(Out of) Level 3	5		(7)
Ending balance at fair value	24		3
Fixed Income Securities [Member] | Mortgage backed and asset backed [Member] | Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance at fair value	561		11
Net Realized and Unrealized Gains/(Losses)			41
Net Purchases, Issuances and Settlements	(11)		151
Net Transfers Into/(Out of) Level 3	(1)		358
Ending balance at fair value	549		561
Fixed Income Securities [Member] | Other [Member] | Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance at fair value	245	[1]
Net Realized and Unrealized Gains/(Losses)	37
Net Purchases, Issuances and Settlements	(27)
Ending balance at fair value	255	[1]
Fixed Income Securities [Member] | Municipal [Member] | Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance at fair value			3
Net Transfers Into/(Out of) Level 3			(3)
Equity securities [Member] | Non United States Common And Preferred Stock [Member] | Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Transfers Into/(Out of) Level 3	1
Ending balance at fair value	1
Private Equity Funds [Member] | Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance at fair value	2,671	[1]
Net Realized and Unrealized Gains/(Losses)	536
Net Purchases, Issuances and Settlements	(249)
Ending balance at fair value	2,958	[1]
Real estate and real assets [Member] | Real Estate [Member] | Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance at fair value	2,128		1,820
Net Realized and Unrealized Gains/(Losses)	232		133
Net Purchases, Issuances and Settlements	64		175
Ending balance at fair value	2,424		2,128
Real estate and real assets [Member] | Real assets [Member] | Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance at fair value	664		547
Net Realized and Unrealized Gains/(Losses)	78		45
Net Purchases, Issuances and Settlements	(36)		72
Ending balance at fair value	706		664
Hedge Funds [Member] | Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance at fair value	1,473		2,451
Net Realized and Unrealized Gains/(Losses)	183		104
Net Purchases, Issuances and Settlements	(627)		52
Net Transfers Into/(Out of) Level 3	80		(1,134)
Ending balance at fair value	1,109		1,473
Private Equity and Other Funds [Member] | Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance at fair value			2,859
Net Realized and Unrealized Gains/(Losses)			208
Net Purchases, Issuances and Settlements			(151)
Ending balance at fair value			2,916	[1]
Global Strategies [Member] | Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance at fair value			75
Net Transfers Into/(Out of) Level 3			$ (75)

[1] Certain private funds with a fixed income strategy were reclassified from private equity to other fixed income on January 1, 2013