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Retirement Benefits - Target and Weighted Average Actual Allocations and Benefit Pension Plans (Details 5) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Pension Plans | Maximum | Common or collective trusts      
Target allocations and the weighted average actual allocations of plan assets      
Redemption notice period to redeem investments   30 days  
Defined Benefit U.S. Pension Plan      
Target allocations and the weighted average actual allocations of plan assets      
Weighted average actual allocation (as a percent)     100.00%
Defined Benefit U.S. Pension Plan | Debt securities      
Target allocations and the weighted average actual allocations of plan assets      
Target allocation, minimum (as a percent)   95.00%  
Target allocation, maximum (as a percent)   100.00%  
Weighted average actual allocation (as a percent)     93.00%
Defined Benefit U.S. Pension Plan | Equity securities      
Target allocations and the weighted average actual allocations of plan assets      
Target allocation, minimum (as a percent)   0.00%  
Target allocation, maximum (as a percent)   5.00%  
Weighted average actual allocation (as a percent)     2.00%
Defined Benefit U.S. Pension Plan | Other      
Target allocations and the weighted average actual allocations of plan assets      
Target allocation, minimum (as a percent)   0.00%  
Target allocation, maximum (as a percent)   5.00%  
Weighted average actual allocation (as a percent)     5.00%
Defined Benefit U.S. Pension Plan | Limited Partnerships | Plan trust | Purchase of investment under prohibited transaction exemption      
Investments      
Purchased from Plan $ 10    
Defined Benefit Non-U.S. Pension Plans      
Target allocations and the weighted average actual allocations of plan assets      
Weighted average actual allocation (as a percent)   100.00% 100.00%
Defined Benefit Non-U.S. Pension Plans | Debt securities      
Target allocations and the weighted average actual allocations of plan assets      
Target allocation, minimum (as a percent)   65.00%  
Target allocation, maximum (as a percent)   75.00%  
Weighted average actual allocation (as a percent)   70.00% 71.00%
Defined Benefit Non-U.S. Pension Plans | Equity securities      
Target allocations and the weighted average actual allocations of plan assets      
Target allocation, minimum (as a percent)   20.00%  
Target allocation, maximum (as a percent)   30.00%  
Weighted average actual allocation (as a percent)   27.00% 25.00%
Defined Benefit Non-U.S. Pension Plans | Other      
Target allocations and the weighted average actual allocations of plan assets      
Target allocation, minimum (as a percent)   0.00%  
Target allocation, maximum (as a percent)   10.00%  
Weighted average actual allocation (as a percent)   3.00% 4.00%
Defined Benefit Non-U.S. Pension Plans | Direct investment in company common stock or debt securities      
Target allocations and the weighted average actual allocations of plan assets      
Weighted average actual allocation (as a percent)   0.00%