Annual report pursuant to Section 13 and 15(d)

Revenue (Details)

v3.20.4
Revenue (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Net income $ 910 $ 817 $ 928
Additions- charged to earnings $ 1,976 $ 2,138 $ 2,213