Employee Retirement Benefits (Details) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Dec. 31, 2015	Oct. 22, 2014 plan
Other disclosures
Number of unfunded plans | plan						2
U.S. Pension Plan
Components of Net Periodic Benefit Cost:
Service cost	$ 1	$ 7	$ 3	$ 21
Interest cost	6	8	20	24
Expected return on plan assets	(11)	(10)	(31)	(30)
Net amortizations	0	0	2	1
Settlement loss	1	2	3	2
Special termination cost	0	4	0	4
Net periodic pension expense (benefit)	(3)	11	(3)	22
Qualified Pension Plan
Other disclosures
Contributions		8		22
Non-Qualified Pension Plan
Other disclosures
Contributions	1	3	17	7
Non U.S. Pension Plan
Components of Net Periodic Benefit Cost:
Service cost	0	1	1	3
Interest cost	3	3	7	7
Expected return on plan assets	(3)	(4)	(11)	(12)
Net amortizations	0	0	1	0
Settlement loss	2	0	2	0
Special termination cost	0	0	0	0
Net periodic pension expense (benefit)	$ 2	$ 0	0	$ (2)
Non U.S. Pension Plan | United Kingdom
Other disclosures
Employer discretionary contribution amount			$ 3
Forecast
Disclosure of net periodic benefit cost
Percent of match, first 3%					100.00%
Percent of match, remaining 2%					50.00%