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Employee Benefit Plans (Summary of Components of Net Periodic Benefit Cost) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
U.S.      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 127 $ 124 $ 121
Interest cost 116 109 108
Expected return on plan assets (128) (138) (142)
Amortization of prior service cost (credit) 3 3 3
Recognized net actuarial loss (gain) 72 75 40
Settlements 8 80 0
Total net periodic benefit cost 198 253 130
Int’l.      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 32 38 38
Interest cost 28 28 35
Expected return on plan assets (38) (37) (37)
Amortization of prior service cost (credit) (1) (1) (2)
Recognized net actuarial loss (gain) 14 15 12
Settlements 0 0 0
Total net periodic benefit cost 35 43 46
Other Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 7 7 7
Interest cost 8 7 8
Expected return on plan assets 0 0 0
Amortization of prior service cost (credit) (1) (2) (1)
Recognized net actuarial loss (gain) 0 (1) (2)
Settlements 0 0 0
Total net periodic benefit cost $ 14 $ 11 $ 12