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Earnings (Loss) Per Common Share Level 4 (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Net Income (Loss) Attributable to Parent [Abstract]        
Net Income (Loss) Attributable to Parent $ (40) $ 216 $ 338 $ 539
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]        
Weighted Average Number of Shares Outstanding, Basic 366.0 391.8 368.7 395.2
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 0.0 3.2 4.0 3.6
Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants 0.0 3.6 2.8 3.6
Weighted Average Number of Shares Outstanding, Diluted 366.0 398.6 375.5 402.4
Earnings Per Share, Basic and Diluted [Abstract]        
Earnings Per Share, Basic $ (0.11) $ 0.55 $ 0.92 $ 1.36
Earnings Per Share, Diluted $ (0.11) $ 0.54 $ 0.90 $ 1.34