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Consolidated Statements of Cash Flows (Unaudited) (Parenthetical) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Statement Of Cash Flows [Abstract]    
Financing leases $ 32 $ 22
Operating leases $ 3 $ 2
Supplemental line of credit facility borrowings expiration period 364 days