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Income Taxes - Provision for income taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current:
Federal	$ 272	$ (9)	$ 134
State	18	3	3
Foreign	8	0	(6)
Total current	298	(6)	131
Deferred:
Federal	(3)	(85)	19
State	(3)	(9)	2
Foreign	0	0	1
Total deferred	(6)	(94)	22
Income tax expense (benefit)	$ 292	$ (100)	$ 153

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