Leases - Carrying Value of Assets Subject to Operating Leases (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Leases [Abstract]
Carrying value of assets subject to operating leases, net of accumulated depreciation	$ 17,553	$ 21,155
Accumulated depreciation	$ 5,737	$ 6,388

Amount of accumulated depreciation of lessor's underlying asset for which right to use has been conveyed to lessee under operating lease.

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Name:	us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAccumulatedDepreciation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant