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Earnings Per Share Of Common Stock (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
EPS of Common Stock        
Income from continuing operations $ 307 $ 341 $ 331 $ 696
Less: Preferred dividends 0 0 0 (3)
Less: Undistributed earnings allocated to preferred stockholders 0 (5) 0 (7)
Income from continuing operations available to common stockholders 307 336 331 686
Discontinued operations, net of tax 2 [1] (29) [1] 52 (64)
Less: Undistributed earnings allocated to preferred stockholders 0 1 0 1
Income (loss) from discontinued operations available to common stockholders 2 (28) 52 (63)
NET INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS $ 309 $ 308 $ 383 $ 623
Share Count information:        
Weighted average number of basic shares outstanding (in shares) 542 532 541 531
Assumed exercise of dilutive stock options and awards (in shares) 1 1 2 2
Weighted average number of diluted shares outstanding 543 533 543 533
Income available to common stockholders, per common share:        
Income from continuing operations, basic (in dollars per share) $ 0.57 $ 0.63 $ 0.61 $ 1.29
Discontinued operations, basic (in dollars per share) 0 (0.05) 0.10 (0.12)
Basic - Net Income Attributable to Common Stockholders (in dollars per share) 0.57 0.58 0.71 1.17
Income from continuing operations, diluted (in dollars per share) 0.57 0.63 0.61 1.29
Discontinued operations, diluted (in dollars per share) 0 (0.05) 0.10 (0.12)
Diluted - Net Income Attributable to Common Stockholders (in dollars per share) $ 0.57 $ 0.58 $ 0.71 $ 1.17
Stock Options        
Income available to common stockholders, per common share:        
Shares excluded from the calculation of diluted shares outstanding, in shares 0 0    
Preferred Stock        
Income available to common stockholders, per common share:        
Shares excluded from the calculation of diluted shares outstanding, in shares     8 8
[1] Net of income tax expense of $1 million and $39 million for the three months ended June 30, 2020 and 2019, respectively, and $(35) million and $44 million for the six months ended June 30, 2020 and 2019, respectively.