Annual report pursuant to Section 13 and 15(d)

Share Repurchase Program (Details)

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Share Repurchase Program (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Equity [Abstract]      
Stock Repurchase Program, Period in Force 3 years    
Stock Repurchase Program, Authorized Amount $ 1,000    
Treasury Stock, Shares, Acquired 4.0    
Payments for Repurchase of Common Stock $ 249 $ 0 $ 0
Treasury Stock Acquired, Average Cost Per Share $ 62.27    
Stock Repurchase Program, Remaining Authorized Repurchase Amount $ 751