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Income Taxes (Reconciliation of Statutory Tax Rates) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Reconciliation of Canadian statutory tax rates                      
Pre-tax income before equity in net loss on non-consolidated affiliates                 $ 205 $ 11 $ 167
Canadian Statutory tax rate                 25.00% 25.00% 25.00%
Provision at the Canadian statutory rate                 $ 51 $ 3 $ 42
Increase (decrease) for taxes on income (loss) resulting from:                      
Exchange translation items                 9 16 (22)
Exchange remeasurement of deferred income taxes                 8 (8) (31)
Change in valuation allowances                 67 104 95
Tax credits                 (14) (22) (22)
Income items not subject to tax                 (3) 0 2
State tax benefit, net                 1 (10) (7)
Dividends not subject to tax                 (23) (52) (52)
Enacted tax rate changes                 1 5 (1)
Tax rate differences on foreign earnings                 36 4 7
Uncertain tax positions                 6 7 10
Prior year adjustments                 4 (2) 2
Income tax settlements                 6 0 (6)
Other — net                 2 1 (3)
Income tax provision (benefit) $ 41 $ 47 $ 27 $ 36 $ 18 $ 16 $ (3) $ 15 $ 151 $ 46 $ 14
Effective tax rate                 73.00% 411.00% 8.00%