Stockholders' Equity Stock Repurchase Program - Additional Information (Details) - USD ($) shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Jan. 29, 2020	Jan. 28, 2016
Class of Stock [Line Items]
Remaining authorized repurchase amount under stock repurchase programs	$ 7,000,000,000.0		$ 7,000,000,000.0
2016 Stock Repurchase Program
Class of Stock [Line Items]
Authorized amount under stock repurchase program						$ 12,000,000,000.0
Shares repurchased and retired (in shares)	0.7	9.0	19.4	21.0
Value of shares repurchased and retired	$ 54,000,000	$ 588,000,000	$ 1,400,000,000	$ 1,400,000,000
2020 Stock Repurchase Program
Class of Stock [Line Items]
Authorized amount under stock repurchase program					$ 5,000,000,000.0