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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 15, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Income Tax Disclosure [Abstract]          
Income tax (benefit) expense   $ 7 $ (4) $ 52 $ 69
Effective income tax rate reconciliation, at federal statutory income tax rate, percent       21.00% 35.00%
U.S. transition tax   78 0 $ 78 $ 0
Earnings (loss) before income taxes   $ 223 $ 268 $ (277) $ 678
Contributions by employer $ 358