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Pension and Other Postretirement Benefits (Schedule of Reconciliation of Plan Assets Measured by Significant Unobservable Inputs) (Details) - Level 3 - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Balance at beginning of period $ 576 $ 642
Foreign currency translation 44 (83)
Asset returns – assets held at reporting date (88) 36
Asset returns – assets sold during the period 85 37
Purchases, sales and settlements, net (99) (56)
Balance at end of period 518 576
Hedge funds    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Balance at beginning of period 207 225
Foreign currency translation 20 (37)
Asset returns – assets held at reporting date (38) 24
Asset returns – assets sold during the period 32 1
Purchases, sales and settlements, net (32) (6)
Balance at end of period 189 207
Private equity    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Balance at beginning of period 215 281
Foreign currency translation 19 (42)
Asset returns – assets held at reporting date (57) 2
Asset returns – assets sold during the period 53 36
Purchases, sales and settlements, net (83) (62)
Balance at end of period 147 215
Real estate    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Balance at beginning of period 154 136
Foreign currency translation 5 (4)
Asset returns – assets held at reporting date 7 10
Purchases, sales and settlements, net 16 12
Balance at end of period $ 182 $ 154