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Income Taxes (Provision for Income Taxes) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Jun. 30, 2019
Sep. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Current tax:            
U.S. federal       $ (1) $ (2) $ 0
State and foreign       202 183 154
Current tax, total       201 181 154
Deferred tax:            
U.S. federal       16 31 217
State and foreign       (51) 4 30
Deferred tax, total       (35) 35 247
Total $ 37 $ 15 $ 28 $ 166 $ 216 $ 401