Retirement Benefits - Effects of One Percentage Point Change in Assumed Health Care Cost Trend Rates (Details) $ in Millions |
12 Months Ended |
---|---|
Dec. 31, 2016
USD ($)
| |
Compensation and Retirement Disclosure [Abstract] | |
Effect of a one percentage point increase in assumed healthcare cost trend on 2010 total service and interest cost components | $ 9 |
Effect of a one percentage point increase in assumed healthcare cost trend on postretirement benefit obligation at December 31, 2010 | 105 |
Effect of a one percentage point decrease in assumed healthcare cost trend on 2010 total service and interest cost components | (8) |
Effect of a one percentage point decrease in assumed healthcare cost trend on postretirement benefit obligation at December 31, 2010 | $ (95) |