Income Taxes (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2014 Rate	Dec. 31, 2013 Rate	Dec. 31, 2012 Rate
Reconciliation of statutory rate to effective income tax rate
Taxes computed at U.S. statutory rates	$ 264,000,000	$ 243,000,000	$ 204,000,000
U.S. statutory tax rate (as a percent)	35.00%	35.00%	35.00%
(Decreases) increases in taxes resulting from:
State Income Tax, net of Federal Tax	0	(1,000,000)	(3,000,000)
State Income Tax, net of Federal Tax (as a percent)	0.00%	(0.10%)	(0.50%)
Subsidiaries' results subject to tax rates other than U.S. statutory rates	(53,000,000)	(68,000,000)	(50,000,000)
Subsidiaries' results subject to tax rates other than U.S. statutory rates (as a percent)	(7.00%)	(9.80%)	(8.60%)
Other, net	(2,000,000)	(7,000,000)	(6,000,000)
Other, net (as a percent)	(0.20%)	(1.00%)	(1.00%)
Provision for income taxes	209,000,000	167,000,000	145,000,000
Provision for income taxes, Effective Income Tax Rate (as a percent)	27.80%	24.10%	24.90%
Undistributed profits of non-U.S. subsidiaries, which are considered indefinitely reinvested	$ 2,000,000,000