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Retirement Benefits - Assumptions for Determining Projected Benefit Obligation and Net Periodic Cost of Defined Benefit Pension Plans (Details) - Defined Benefit Pension Plans - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Effect of change in assumptions used in calculations      
Increase in plan liability, if discount rate were reduced by 25 basis points $ 57    
U.S.      
For determining net periodic cost for the year:      
Discount rates (as a percent)     1.95%
Expected long-term rates of return on assets (as a percent)     2.95%
Minimum | Non-U.S.      
For determining projected benefit obligation at year-end:      
Discount rates (as a percent) 1.90% 1.90% 2.35%
Rates of increase in compensation levels (as a percent) 2.25% 2.25% 2.25%
For determining net periodic cost for the year:      
Discount rates (as a percent) 1.90% 1.90% 2.20%
Rates of increase in compensation levels (as a percent) 2.25% 2.25% 2.25%
Expected long-term rates of return on assets (as a percent) 1.90% 4.30% 4.90%
Maximum      
Estimated future employer contributions to defined benefit pension plans      
Expected contributions in next fiscal year $ 25    
Maximum | Non-U.S.      
For determining projected benefit obligation at year-end:      
Discount rates (as a percent) 5.50% 5.00% 5.50%
Rates of increase in compensation levels (as a percent) 7.00% 7.00% 7.00%
For determining net periodic cost for the year:      
Discount rates (as a percent) 5.00% 5.50% 5.00%
Rates of increase in compensation levels (as a percent) 7.00% 7.00% 8.00%
Expected long-term rates of return on assets (as a percent) 7.40% 7.00% 7.00%