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Income Taxes (Provision for Income Taxes) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Current tax:        
U.S. federal   $ 0 $ (1) $ (2)
State and foreign   211 202 183
Current tax, total   211 201 181
Deferred tax:        
U.S. federal   37 16 31
State and foreign   (4) (51) 4
Deferred tax, total   33 (35) 35
Total $ 37 $ 244 $ 166 $ 216