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Earnings (Loss) Per Common Share Level 4 (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Income (Loss) from Continuing Operations Attributable to Parent $ 438 $ 372 $ 977 $ 1,252
Net Income (Loss) Attributable to Parent [Abstract]        
Net Income (Loss) Attributable to Parent $ 438 $ 381 $ 977 $ 1,261
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]        
Weighted Average Number of Shares Outstanding, Basic 383.8 413.8 391.4 418.4
Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants 3.5 4.1 3.6 4.9
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 3.2 5.1 3.5 5.0
Weighted Average Number of Shares Outstanding, Diluted 390.5 423.0 398.5 428.3
Earnings Per Share, Basic and Diluted [Abstract]        
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest $ 0 $ 9 $ 0 $ 9
Income (Loss) from Continuing Operations, Per Basic Share $ 1.14 $ 0.90 $ 2.50 $ 2.99
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share 0.00 0.02 0.00 0.02
Earnings Per Share, Basic 1.14 0.92 2.50 3.01
Income (Loss) from Continuing Operations, Per Diluted Share 1.12 0.88 2.45 2.92
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share 0.00 0.02 0.00 0.02
Earnings Per Share, Diluted $ 1.12 $ 0.90 $ 2.45 $ 2.94