XML 128 R101.htm IDEA: XBRL DOCUMENT v3.20.4
Leases (Other Information) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]    
Operating cash flows from operating leases $ 323 $ 387
Investing cash flows from operating leases 30 21
Operating cash flows from finance leases 29 35
Financing cash flows from finance leases 113 112
Leased assets obtained in exchange for new operating lease liabilities $ 93 $ 118