XML 114 R96.htm IDEA: XBRL DOCUMENT v3.20.4
Income Taxes - Schedule of Unrecognized Tax Benefits (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Schedule Of Unrecognized Tax Benefits [Line Items]      
Balance at the beginning of the year $ 1,223 $ 1,072 $ 1,034
Increase (decrease) related to prior year tax positions, net (238) 23 76
Increase related to current year tax positions 10 246 11
Decrease related to settlements with tax authorities and lapse of applicable statutes of limitations (105) (118) (49)
Other (2)    
Balance at the end of the year $ 888 $ 1,223 $ 1,072