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Pension and Other Postretirement Benefit Plans (Change in Benefit Obligation) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2011
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
United States Pension Benefits        
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]        
Benefit obligation, beginning of year   $ 3,796 $ 3,546  
Service cost   3 2 $ 2
Interest cost   150 167 162
Plan participants’ contributions   0 0  
Actuarial loss (gain)   (164) 384  
Benefits paid   (315) (303)  
Plan amendments   0 0  
Acquisitions   0 0  
Transfer of benefits   0 0  
Settlements / curtailment (gain)   0 0  
Foreign currency exchange rates   0 0  
Benefit obligation, end of year   3,470 3,796 3,546
Accumulated benefit obligation, end of year   3,459 3,786  
Foreign Pension Benefits        
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]        
Benefit obligation, beginning of year   1,026 439  
Service cost   5 5 6
Interest cost   31 22 17
Plan participants’ contributions   1 1  
Actuarial loss (gain)   (11) 59  
Benefits paid   (31) (24)  
Plan amendments   (3) (3)  
Acquisitions   0 610  
Transfer of benefits   0 0  
Settlements / curtailment (gain)   (66) (15)  
Foreign currency exchange rates   (87) (68)  
Benefit obligation, end of year   865 1,026 439
Accumulated benefit obligation, end of year   806 964  
Other Postretirement Benefits        
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]        
Benefit obligation, beginning of year   502 509  
Service cost   2 3 4
Interest cost   19 24 18
Plan participants’ contributions   7 7  
Actuarial loss (gain)   (32) 9  
Benefits paid   (55) (60)  
Plan amendments $ (138) 8 14  
Acquisitions   0 0  
Transfer of benefits   0 0  
Settlements / curtailment (gain)   0 0  
Foreign currency exchange rates   (10) (4)  
Benefit obligation, end of year   $ 441 $ 502 $ 509