v3.22.0.1
Variable Interest Entities (Narrative) (Details) - USD ($)
$ in Millions
 1 Months Ended
Jun. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Variable Interest Entity [Line Items]      
Assets not available for use   $ 359,268 $ 319,616
Liabilities with no recourse   107,633 97,072
Noncontrolling interest   4,300 3,900
Carrying value of unconsolidated VIE   2,700 1,700
VIE maximum exposure   2,900 1,900
Variable Interest Entity, Primary Beneficiary | Waymo      
Variable Interest Entity [Line Items]      
Additional funding $ 2,500    
Variable Interest Entity, Primary Beneficiary | Nonrecourse      
Variable Interest Entity [Line Items]      
Liabilities with no recourse   2,500 2,300
Variable Interest Entity, Primary Beneficiary | Asset Pledged as Collateral      
Variable Interest Entity [Line Items]      
Assets not available for use   $ 6,000 $ 5,700