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Consolidated Statement of Stockholder's Equity - USD ($)
$ in Millions
Total
Common Stock
Capital in excess of par value
Retained earnings
Accumulated other comprehensive income (loss)
Treasury stock
Balance at beginning of period at Dec. 31, 2014 $ 6,775 $ 808 $ 1,315 $ 7,416 $ (738) $ (2,026)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Repurchase of common stock (1,180) 0 0 0 0 (1,180)
Issuance of common and treasury stock pursuant to Employee stock plans 30 0 6 0 0 24
Net tax benefit (expense) of options exercised   0   0 0 0
Adjustments to Additional Paid in Capital, Income Tax Deficiency from Share-based Compensation 24   24      
Share-based compensation 29 0 29 0 0 0
Cash dividends (188) 0 0 (188) 0 0
Comprehensive income 1,868 0 0 2,181 (313) 0
Balance at end of period at Dec. 31, 2015 7,358 808 1,374 9,409 (1,051) (3,182)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Repurchase of common stock (1,750) 0 0 0 0 (1,750)
Issuance of common and treasury stock pursuant to Employee stock plans 20 0 8 0 0 12
Issuance of stock for conversion of debt 43 0 (5) 0 0 48
Share-based compensation 33 0 33 0 0 0
Cash dividends (235) 0 0 (235) 0 0
Comprehensive income 2,972 0 0 2,244 728 0
Balance at end of period at Dec. 31, 2016 8,441 808 1,410 11,418 (323) (4,872)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Repurchase of common stock (1,600) 0 0 0 0 (1,600)
Issuance of common and treasury stock pursuant to Employee stock plans 14 0 4 0 0 10
Share-based compensation 37 0 37 0 0 0
Cash dividends (285) 0 0 (285) 0 0
Comprehensive income 3,823 0 0 3,488 335 0
Balance at end of period at Dec. 31, 2017 $ 10,430 $ 808 $ 1,451 $ 14,621 $ 12 $ (6,462)