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Shareholders' Equity (Details) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Balance at beginning of period $ 2,293 $ 2,731  
Net income 225 423  
Other comprehensive loss (18) (2)  
Share-based compensation 19 19  
Shares issued under stock plans (5) (10)  
Purchases of treasury stock (120) (398)  
Balance at end of period $ 2,394 $ 2,971  
Common Shares      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Balance at beginning of period (in shares) 791 791  
Balance at beginning of period $ 8 $ 8  
Balance at end of period (in shares) 791 791  
Balance at end of period $ 8 $ 8  
Treasury Stock      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Balance at beginning of period (in shares) 399 376  
Balance at beginning of period $ (10,340) $ (8,494)  
Shares issued under stock plans (in shares) (2) (2)  
Shares issued under stock plans $ 37 $ 35  
Purchases of treasury stock (in shares) 2 6  
Purchases of treasury stock $ (120) $ (398)  
Balance at end of period (in shares) 399 380  
Balance at end of period $ (10,423) $ (8,857)  
Additional Paid-In Capital      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Balance at beginning of period 1,057 1,031  
Share-based compensation 19 19  
Shares issued under stock plans (42) (45)  
Balance at end of period 1,034 1,005  
Accumulated Other Comprehensive Loss      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Balance at beginning of period (67) (54)  
Other comprehensive loss (18) (2)  
Balance at end of period (85) (56)  
Retained Earnings      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Balance at beginning of period 11,635 10,240  
Net income 225 423  
Balance at end of period $ 11,860 $ 10,871  
Accounting Standards Update 2014-09      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Cumulative-effect adjustment of ASU adoption     $ 208
Accounting Standards Update 2014-09 | Retained Earnings      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Cumulative-effect adjustment of ASU adoption     208
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2017-12 | Accumulated Other Comprehensive Loss      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Cumulative-effect adjustment of ASU adoption     3
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2017-12 | Retained Earnings      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Cumulative-effect adjustment of ASU adoption     (3)
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2018-02 | Accumulated Other Comprehensive Loss      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Cumulative-effect adjustment of ASU adoption     (3)
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2018-02 | Retained Earnings      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Cumulative-effect adjustment of ASU adoption     $ 3