v3.19.3.a.u2
Sale Of Receivables (Narrative) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts payable and accrued liabilities $ 45,956 $ 43,184
Guarantee Obligations [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts payable and accrued liabilities 148 196
Guarantee Obligation 384 439
Other Assets [Member] | Deferred Purchase Price [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Other Assets 2,336 2,370
Other Current Assets [Member] | Deferred Purchase Price [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Other Assets 1,569 $ 1,448
WarnerMedia [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Agreement Amount With Purchaser To Transfer Financial Assets Accounted For As Sales 4,300  
Pledged Assets, Not Separately Reported, Finance Receivables $ 3,324