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Shareholders' Equity (AOCI) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Changes in accumulated other comprehensive loss, presented net of tax        
Balance, beginning of period     $ (334)  
Balance, end of period $ (327)   (327)  
Defined benefit pension plans        
Changes in accumulated other comprehensive loss, presented net of tax        
Balance, beginning of period (343) $ (410) (334) $ (404)
Other comprehensive income (loss) before reclassifications 8 33 (2) 22
Reclassifications to net income 8 9 9 14
Other comprehensive income, net 16 42 7 36
Balance, end of period $ (327) $ (368) $ (327) $ (368)