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Pension and Other Postretirement Benefits (Schedule of Reconcile of Plan Assets Measured by Significant Unobservable Inputs) (Details) - Level 3 [Member] - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Balance at beginning of period $ 642 $ 695
Foreign currency translation (83) (31)
Asset returns – assets held at reporting date 36 (13)
Asset returns – assets sold during the period 37 71
Purchases, sales and settlements, net (56) (80)
Balance at end of period 576 642
Hedge funds [Member]    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Balance at beginning of period 225 252
Foreign currency translation (37) (11)
Asset returns – assets held at reporting date 24 (7)
Asset returns – assets sold during the period 1 17
Purchases, sales and settlements, net (6) (26)
Balance at end of period 207 225
Private equity [Member]    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Balance at beginning of period 281 333
Foreign currency translation (42) (16)
Asset returns – assets held at reporting date 2 (17)
Asset returns – assets sold during the period 36 54
Purchases, sales and settlements, net (62) (73)
Balance at end of period 215 281
Real estate [Member]    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Balance at beginning of period 136 110
Foreign currency translation (4) (4)
Asset returns – assets held at reporting date 10 11
Asset returns – assets sold during the period 0 0
Purchases, sales and settlements, net 12 19
Balance at end of period $ 154 $ 136