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Earnings (Loss) Per Common Share Level 4 (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Net Income (Loss) Attributable to Parent [Abstract]    
Net Income (Loss) Attributable to Parent $ 323 $ 467
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]    
Weighted Average Number of Shares Outstanding, Basic 398.5 422.6
Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants 3.6 5.6
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 4.2 5.5
Weighted Average Number of Shares Outstanding, Diluted 406.3 433.7
Earnings Per Share, Basic and Diluted [Abstract]    
Earnings Per Share, Basic $ 0.81 $ 1.11
Earnings Per Share, Diluted $ 0.79 $ 1.08