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Earnings Per Share (Schedule of Earnings Per Share, Basic and Diluted) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Class of Stock [Line Items]                      
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent                 $ 43 $ 302 $ 985
Weighted Average Number of Shares Outstanding, Basic (in shares)                 665 664 662
Income (Loss) from Continuing Operations, Per Basic Share $ 0.48 $ (0.50) $ (0.13) $ 0.22 $ (0.12) $ 0.32 $ 0.02 $ 0.23 $ 0.06 $ 0.46 $ 1.49
Weighted Average Number of Shares Outstanding, Diluted (in shares)                 668 667 665
Income (Loss) from Continuing Operations, Per Diluted Share $ 0.47 $ (0.50) $ (0.13) $ 0.22 $ (0.12) $ 0.32 $ 0.02 $ 0.23 $ 0.06 $ 0.45 $ 1.48
Share-based Payment Arrangement, Option [Member]                      
Class of Stock [Line Items]                      
Dilutive Securities, Effect on Basic Earnings Per Share, Options and Restrictive Stock Units                 $ 0 $ 0 $ 0
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements (in shares)                 1 0 0
Dilutive Securities Effect On Basic EPS, dilutive Stock Options, per diluted share                 $ 0 $ 0 $ 0
Restricted Stock Units (RSUs) [Member]                      
Class of Stock [Line Items]                      
Dilutive Securities, Effect on Basic Earnings Per Share, Options and Restrictive Stock Units                 $ 0 $ 0 $ 0
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements (in shares)                 2 3 3
Dilutive Securities Effect On Basic EPS, dilutive Restricted Stock Units, per diluted share                 $ 0 $ (0.01) $ (0.01)