Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity - Common Stock Narrative (Details)

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Shareholders' Equity - Common Stock Narrative (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Oct. 24, 2018
Jul. 26, 2018
Apr. 25, 2018
Jan. 31, 2018
Sep. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Common Stock              
Common stock repurchased           $ 14,863 $ 7,945
Common stock dividends declared (in dollars per share)   $ 0.15 $ 0.12 $ 0.120 $ 0.15    
Share-based compensation, number of shares authorized (in shares)         787.0 787.0  
Common Stock Including Additional Paid in Capital [Member]              
Common Stock              
Common stock repurchased (in shares)         164.0 481.8 334.6
Common stock repurchased         $ 5,000 $ 14,863 $ 7,945
Stock issued (in shares)           52.8 39.5
Common Stock              
Common Stock              
Stock issued (in shares)           74.0  
Shares paid for tax withholding for share based compensation (in shares)           29.0  
Warrants Expiring October 29, 2018              
Common Stock              
Warrants outstanding (in shares)         122.0 122.0  
Exercise price per warrant (in dollars per share)         $ 30.79 $ 30.79  
Warrants Expiring January 16, 2019              
Common Stock              
Warrants outstanding (in shares)         130.0 130.0  
Minimum required dividend rate (in dollars per share)         $ 0.01 $ 0.01  
Exercise price per warrant (in dollars per share)         $ 12.609 $ 12.609  
Subsequent Event              
Common Stock              
Common stock dividends declared (in dollars per share) $ 0.15