Leases - Supplemental Cash Flow (Details) - USD ($) $ in Millions |
9 Months Ended | |
|---|---|---|
Sep. 30, 2020 |
Sep. 30, 2019 |
|
| Cash paid for amounts included in the measurement of lease liabilities: | ||
| Operating cash flows from operating leases | $ 878 | $ 633 |
| Operating cash flows from finance leases | 11 | 8 |
| Financing cash flows from finance leases | 398 | 411 |
| Lease liabilities arising from obtaining right-of-use assets: | ||
| Operating leases | 954 | 3,756 |
| Finance leases | $ 101 | $ 128 |
| X | ||||||||||
- Definition Cash Flow, Lessee [Abstract] No definition available.
|
| X | ||||||||||
- Definition Finance Lease Liability In Exchange For Right-Of-Use Asset Obtained1 No definition available.
|
| X | ||||||||||
- Definition Operating Lease Liability In Exchange For Right-Of-Use Asset Obtained No definition available.
|
| X | ||||||||||
- Definition Right-Of-Use Asset Obtained In Exchange For Lease Liability [Abstract] No definition available.
|
| X | ||||||||||
- Definition Amount of interest paid on finance lease liability. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount of cash outflow for principal payment on finance lease. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|