v3.3.1.900
Pension And Other Postretirement Benefits (Assets Recorded In Balance Sheet And Other Comprehensive Income) (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]    
Postretirement benefits reserves $ (22,647) $ (25,802)
Pension Benefits - U.S. [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Balance at December 31 [1] (8,598) (7,614)
Current liabilities (311) (340)
Postretirement benefits reserves (8,287) (7,274)
Total recorded (8,598) (7,614)
Net actuarial loss/(gain) 6,138 6,589
Prior service cost 21 27
Total recorded in accumulated other comprehensive income 6,159 6,616
Pension Benefits - Non-U.S. [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Balance at December 31 [1] (6,700) (9,952)
Other assets 454 302
Current liabilities (299) (325)
Postretirement benefits reserves (6,855) (9,929)
Total recorded (6,700) (9,952)
Net actuarial loss/(gain) 6,413 9,642
Prior service cost (83) 429
Total recorded in accumulated other comprehensive income 6,330 10,071
Other Postretirement Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Balance at December 31 [1] (7,868) (8,968)
Current liabilities (363) (369)
Postretirement benefits reserves (7,505) (8,599)
Total recorded (7,868) (8,968)
Net actuarial loss/(gain) 2,171 2,997
Prior service cost (460) 51
Total recorded in accumulated other comprehensive income $ 1,711 $ 3,048
[1] Fair value of assets less benefit obligation shown on the preceding page.