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Earnings Per Share Of Common Stock (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
EPS of Common Stock        
Income from continuing operations $ 58 $ 307 $ 393 $ 331
Discontinued operations, net of tax [1] 0 2 0 52
NET INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS $ 58 $ 309 $ 393 $ 383
Share count information:        
Weighted average number of basic shares outstanding (in shares) 544,000 542,000 544,000 541,000
Assumed exercise of dilutive stock options and awards (in shares) 1,000 1,000 1,000 2,000
Weighted average number of diluted shares outstanding 545,000 543,000 545,000 543,000
Income available to common stockholders, per common share:        
Income from continuing operations, basic (in dollars per share) $ 0.11 $ 0.57 $ 0.72 $ 0.61
Discontinued operations, basic (in dollars per share) 0 0 0 0.10
Basic - Net Income Attributable to Common Stockholders (in dollars per share) 0.11 0.57 0.72 0.71
Income from continuing operations, diluted (in dollars per share) 0.11 0.57 0.72 0.61
Discontinued operations, diluted (in dollars per share) 0 0 0 0.10
Diluted - Net Income Attributable to Common Stockholders (in dollars per share) $ 0.11 $ 0.57 $ 0.72 $ 0.71
Stock Options        
Income available to common stockholders, per common share:        
Shares excluded from the calculation of diluted shares outstanding, in shares 0 0 0 0
[1] Net of income tax expense (benefits) of $1 million and $(35) million for the three and six months ended June 30, 2020, respectively.