Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Schedule of Repurchase Agreements (Details)

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Stockholders' Equity - Schedule of Repurchase Agreements (Details) - USD ($)
shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Shares Repurchase Activity [Line Items]      
Amount $ 2,159 $ 1,297 $ 1,403
Open Market Repurchases      
Shares Repurchase Activity [Line Items]      
Shares (in shares) 364 209 271
Amount $ 2,159 $ 1,297 $ 1,403