v3.19.3
Accounting Changes - Tax Reform and Leases (Details) - USD ($)
$ in Millions
 9 Months Ended
Jan. 01, 2018
Sep. 30, 2019
Jan. 01, 2019
Leases      
Package of practical expedients   true  
Operating right-of-use assets   $ 4,901 [1] $ 4,800
Financing right-of-use assets     200
Operating lease liabilities   5,167 5,100
Financing lease liabilities   $ 155 $ 200
Stranded tax effects      
Reclassification from AOCI to retained earnings for stranded tax effects of U.S. tax reform $ (2,400)    
[1] * Reflects the adoption of the FASB guidance on leases. Refer to note 2, “Accounting Changes” and note 5, “Leases.”