v3.3.1.900
Pension Benefits Change in Assumptions (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2015
USD ($)
Compensation and Retirement Disclosure [Abstract]  
Defined Benefit Plan, Change in Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Decrease 0.25%
Defined Benefit Plan, Effect of Change in Assumption Used Calculating Net Periodic Benefit Cost, Discount Rate Decrease $ 8
Defined Benefit Plan, Change in Assumptions Used Calculating Benefit Obligation, Discount Rate Decrease 0.25%
Defined Benefit Plan, Effect of Change in Assumption Used Calculating Benefit Obligation, Discount Rate Decrease $ 88
Defined Benefit Plan, Change in Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Increase 0.25%
Defined Benefit Plan, Effect of Change in Assumption Used Calculating Net Periodic Benefit Cost, Discount Rate Increase $ (6)
Defined Benefit Plan, Change in Assumptions Used Calculating Benefit Obligation, Discount Rate Increase 0.25%
Defined Benefit Plan, Effect of Change in Assumption Used Calculating Benefit Obligation, Discount Rate Increase $ (81)
Defined Benefit Plan, Change in Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets Decrease 0.25%
Defined Benefit Plan, Effect of Change in Assumption Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets Decrease $ 3
Defined Benefit Plan, Change in Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets Increase 0.25%
Defined Benefit Plan, Effect of Change in Assumption Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets Increase $ (3)