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Postretirement Plans (Schedule Of Changes In The Benefit Obligation, Plan Assets And Funded Status Of Both Pensions And OPB) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Company contribution   $ 3,500  
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]      
Accrued pension plan liability, net $ (15,323) (16,471)  
Pension Plans [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Beginning balance 80,393 76,745  
Service cost 430 402 $ 604
Interest cost 2,781 2,991 3,050
Amendments (377) (7)  
Actuarial (gain)/loss (6,352) 5,653  
Settlement/curtailment/other (730) (751)  
Gross benefits paid (4,700) (4,658)  
Exchange rate adjustment (21) 18  
Ending balance 71,424 80,393 76,745
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Beginning balance at fair value 64,011 56,692  
Actual return on plan assets (2,585) 8,552  
Company contribution 16 4,025  
Settlement payments (764) (744)  
Benefits paid (4,557) (4,530)  
Exchange rate adjustment (19) 16  
Ending balance at fair value 56,102 64,011 56,692
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]      
Other assets 138 218  
Other accrued liabilities (137) (129)  
Accrued pension plan liability, net (15,323) (16,471)  
Net amount recognized (15,322) (16,382)  
Other Postretirement Benefits Plans [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Beginning balance 6,085 6,431  
Service cost 94 106 128
Interest cost 194 229 262
Amendments (58) (35)  
Actuarial (gain)/loss (732) (204)  
Settlement/curtailment/other    
Gross benefits paid (487) (481)  
Subsidies 24 33  
Exchange rate adjustment (6) 6  
Ending balance 5,114 6,085 6,431
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Beginning balance at fair value 143 134  
Actual return on plan assets (3) 15  
Company contribution 2 6  
Plan participants' contributions 7 4  
Benefits paid (17) (16)  
Ending balance at fair value 132 143 $ 134
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]      
Other accrued liabilities (398) (397)  
Accrued retiree health care (4,584) (5,545)  
Net amount recognized $ (4,982) $ (5,942)