Accumulated Other Comprehensive Loss - (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Loss
Beginning Balance	$ (749)
Amounts reclassified from accumulated other comprehensive loss:
Deferred taxes	15	$ 9	$ (23)
Ending Balance	(1,005)	(749)
Pensions and Other Postretirement Benefits
Accumulated Other Comprehensive Loss
Beginning Balance	(246)	(217)
Pensions and other postretirement benefits:
Actuarial net (loss) gain arising in the year	(18)	(38)
Deferred taxes	10	10
Amounts reclassified from accumulated other comprehensive loss:
Amortization of net actuarial loss	16	14
Amortization of prior service credit	(10)	(14)
Curtailment	(18)
Deferred taxes	5	(1)
Ending Balance	(261)	(246)	(217)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Loss
Beginning Balance	(503)	(287)
Foreign currency translation adjustments	(241)	(216)
Amounts reclassified from accumulated other comprehensive loss:
Ending Balance	(744)	(503)	(287)
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Loss
Beginning Balance	(749)	(504)
Foreign currency translation adjustments	(241)	(216)
Pensions and other postretirement benefits:
Actuarial net (loss) gain arising in the year	(18)	(38)
Deferred taxes	10	10
Amounts reclassified from accumulated other comprehensive loss:
Amortization of net actuarial loss	16	14
Amortization of prior service credit	(10)	(14)
Curtailment	(18)
Deferred taxes	5	(1)
Ending Balance	$ (1,005)	$ (749)	$ (504)