XML 71 R54.htm IDEA: XBRL DOCUMENT v3.20.4
Leases - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]    
Lease and rental expense $ 341 $ 364
Finance Lease, Depreciation, Amortization, And Interest Expense 44 31
Operating lease, payments $ 317 $ 341