XML 40 R49.htm IDEA: XBRL DOCUMENT v3.19.3
Leases - Components of Lease Cost (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Leases [Abstract]        
Operating lease cost $ 255 $ 302 $ 786 $ 940
Variable and short-term lease cost 643 664 1,910 1,944
Amortization of finance lease assets 15 17 51 57
Interest on finance lease liabilities 27 17 86 26
Sublease income (8) (9) (25) (30)
Total lease cost $ 932 $ 991 $ 2,808 $ 2,937