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Pension and Other Postretirement Benefit Plans (Change in Plan Assets) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets, beginning of year $ 3,682  
Fair value of plan assets, end of year 3,293 $ 3,682
United States Pension Benefits    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets, beginning of year 3,042 2,835
Actual return on plan assets (62) 381
Employer contribution 76 129
Plan participants’ contributions 0 0
Benefits paid (315) (303)
Acquisitions 0 0
Other Adjustments 0 0
Settlements 0 0
Foreign currency exchange rates 0 0
Fair value of plan assets, end of year 2,741 3,042
Foreign Pension Benefits    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets, beginning of year 640 206
Actual return on plan assets 16 33
Employer contribution 39 30
Plan participants’ contributions 1 1
Benefits paid (31) (24)
Acquisitions 0 437
Other Adjustments 4 0
Settlements (73) (10)
Foreign currency exchange rates (44) (33)
Fair value of plan assets, end of year 552 640
Other Postretirement Benefits    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets, beginning of year 0 0
Actual return on plan assets 0 0
Employer contribution 48 53
Plan participants’ contributions 7 7
Benefits paid (55) (60)
Acquisitions 0 0
Other Adjustments 0 0
Settlements 0 0
Foreign currency exchange rates 0 0
Fair value of plan assets, end of year $ 0 $ 0