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Postretirement Benefit Plans (Cost of Pension Plans) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Principal pension plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost for benefits earned $ 307 $ 348 $ 913 $ 1,076
Prior service cost amortization 76 51 228 154
Expected return on plan assets (837) (826) (2,507) (2,478)
Interest cost on benefit obligation 736 696 2,205 2,087
Net actuarial gain (loss) amortization 612 823 1,836 2,468
Curtailment loss 0 0 (1) 71
Pension plans costs 894 1,092 2,674 3,378
Other pension plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost for benefits earned 106 99 337 299
Prior service cost amortization 0 (1) 1 (1)
Expected return on plan assets (264) (211) (786) (625)
Interest cost on benefit obligation 172 133 512 396
Net actuarial gain (loss) amortization 68 72 197 217
Pension plans costs 82 94 259 288
Principal retiree benefit plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost for benefits earned 32 27 84 119
Prior service cost amortization 41 38 123 (29)
Expected return on plan assets (11) (12) (33) (36)
Interest cost on benefit obligation 62 67 188 268
Net actuarial gain (loss) amortization (12) (14) (39) (11)
Curtailment loss 0 0 0 192
Pension plans costs $ 30 $ 30 $ 77 $ 177