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Income Taxes Income Taxes (Components of Foreign Income Tax) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Operating Loss Carryforwards [Line Items]      
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent 3.00% 0.00% 4.00%
Foreign Income Tax Expense (Benefit), Continuing Operations $ (77) $ (121) $ (140)
International [Member]      
Operating Loss Carryforwards [Line Items]      
Foreign Income Tax Expense (Benefit), Continuing Operations (81) (81) (62)
CANADA      
Operating Loss Carryforwards [Line Items]      
Foreign Income Tax Expense (Benefit), Continuing Operations 3 6 (3)
AUSTRALIA      
Operating Loss Carryforwards [Line Items]      
Foreign Income Tax Expense (Benefit), Continuing Operations 16 (24) (41)
UNITED KINGDOM      
Operating Loss Carryforwards [Line Items]      
Foreign Income Tax Expense (Benefit), Continuing Operations $ (15) $ (22) $ (34)