Annual report pursuant to Section 13 and 15(d)

Income Taxes - Schedule of Reserve for Uncertain Tax Positions That May BE Challenged (Details)

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Income Taxes - Schedule of Reserve for Uncertain Tax Positions That May BE Challenged (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Gross unrecognized tax benefits, beginning of period $ 257 $ 277 $ 257
Gross increases:      
Current year tax positions   39 7
Prior year tax positions   14 14
Gross decreases:      
Prior year tax positions $ 0 (8)  
Settlements   (16)  
Statute of limitation lapses   (1) (1)
Gross unrecognized tax benefits, end of period   $ 305 $ 277