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Basis of Presentation and Accounting Policies (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Mar. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
New Accounting Pronouncements              
Shareholders' equity $ (26,943)     $ (25,943) $ (25,321)    
Retained earnings [Member]              
New Accounting Pronouncements              
Shareholders' equity $ (37,069) $ (37,325)   (36,977) $ (36,135) $ (35,795) $ (35,204)
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Retained earnings [Member]              
New Accounting Pronouncements              
Shareholders' equity     $ 43 $ 43