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Pension and Other Postretirement Benefits (Change in Benefit Obligation) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]          
Service period over which benefits vest     5 years    
Percent of plan assets' fair value invested in Company common stock 2.80% 2.80% 2.80% 2.80%  
Pension settlement charges $ 352 $ 211 $ 352 $ 211 $ 0
Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Net benefit costs, other than service cost     438 281 26
Pension benefits [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Settlements     (862) (518)  
Pension settlement charges     352 211 0
Change in benefit obligation:          
Benefit obligation, beginning of year     4,660 4,911  
Service cost     29 29 31
Interest cost     191 215 209
Actuarial loss (gain)     337 353  
Benefits paid     (326) (328)  
Participants’ contributions     0 0  
Retiree Medicare drug subsidy     0 0  
Settlements     (862) (518)  
Cumulative translation adjustments     11 (2)  
Benefit obligation, end of year 4,040 4,660 4,040 4,660 4,911
Pension benefits [Member] | Group Annuity Purchase [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Settlements (800)        
Change in benefit obligation:          
Settlements (800)        
Postretirement benefits [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Settlements     0 0  
Pension settlement charges     0 0 0
Change in benefit obligation:          
Benefit obligation, beginning of year     447 486  
Service cost     0 0 0
Interest cost     18 20 20
Actuarial loss (gain)     19 (5)  
Benefits paid     (73) (69)  
Participants’ contributions     10 11  
Retiree Medicare drug subsidy     3 4  
Settlements     0 0  
Cumulative translation adjustments     0 0  
Benefit obligation, end of year $ 424 $ 447 424 $ 447 $ 486
Qualified Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Contribution amount     600    
Qualified Plan [Member] | Pension benefits [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Percent of pension obligations settled 20.00%     12.00%  
Pension settlement charges     $ 352