v3.10.0.1
Total Equity (Preferred Stock Dividends) (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Preferred Stock Dividends      
Preferred stock dividends declared [1] $ 526 $ 523 $ 468
Series A      
Preferred Stock Dividends      
Preferred stock dividend declared (per share) $ 1,011 $ 1,014 $ 1,017
Preferred stock dividends declared $ 45 $ 45 $ 45
Series C      
Preferred Stock Dividends      
Preferred stock dividend declared (per share) $ 100 $ 100 $ 100
Preferred stock dividends declared $ 52 $ 52 $ 52
Series E      
Preferred Stock Dividends      
Preferred stock dividend declared (per share) $ 1,781 $ 1,781 $ 1,781
Preferred stock dividends declared $ 61 $ 61 $ 62
Series F      
Preferred Stock Dividends      
Preferred stock dividend declared (per share) $ 1,719 $ 1,719 $ 1,719
Preferred stock dividends declared $ 58 $ 58 $ 58
Series G      
Preferred Stock Dividends      
Preferred stock dividend declared (per share) $ 1,656 $ 1,656 $ 1,656
Preferred stock dividends declared $ 33 $ 33 $ 33
Series H      
Preferred Stock Dividends      
Preferred stock dividend declared (per share) $ 1,363 $ 1,363 $ 1,363
Preferred stock dividends declared $ 71 $ 71 $ 71
Series I      
Preferred Stock Dividends      
Preferred stock dividend declared (per share) $ 1,594 $ 1,594 $ 1,594
Preferred stock dividends declared $ 64 $ 64 $ 64
Series J      
Preferred Stock Dividends      
Preferred stock dividend declared (per share) $ 1,388 $ 1,388 $ 1,388
Preferred stock dividends declared $ 83 $ 83 $ 83
Series K      
Preferred Stock Dividends      
Preferred stock dividend declared (per share) $ 1,463 $ 1,402  
Preferred stock dividends declared $ 59 $ 56  
[1]

See Note 15 for information regarding dividend s per share for each class of preferred stock.