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Income Taxes (Components Of The Provision (Benefit) For Income Taxes) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]        
Current Federal Tax Expense (Benefit)   $ (17) $ 41 $ (6)
Deferred Federal Income Tax Expense (Benefit)   8 (333) 17
Federal Income Tax Expense (Benefit), Continuing Operations   (9) (292) 11
Current Foreign Tax Expense (Benefit)   (55) (110) (109)
Deferred Foreign Income Tax Expense (Benefit)   (22) (11) (31)
Foreign Income Tax Expense (Benefit), Continuing Operations   (77) (121) (140)
Other Tax Expense (Benefit)   0 1 4
Deferred Other Tax Expense (Benefit)   0 (9) (4)
Other Income Tax Expense (Benefit), Continuing Operations   0 (8) 0
Current Income Tax Expense (Benefit)   (72) (68) (111)
Deferred Income Tax Expense (Benefit)   (14) (353) (18)
Income Tax Expense (Benefit) $ (391) $ (86) $ (421) $ (129)