Stock-Based Awards and Other Equity Instruments - Additional Information (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for new stock-based awards, shares	7,000
Market value of shares vested in period	$ 117	$ 68	$ 65
Stock-based compensation	241	203	149
Stock-based compensation tax benefit	55	39	38
Cash received from stock-based award exercises	284	149
Income tax benefit associated with employees exercise of stock-based awards	60	$ 34	$ 100
Unrecognized stock-based compensation expense	$ 454
Unrecognized stock-based compensation expense expected recognition period	2 years 6 months 21 days
Employee Stock Purchase Plan 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock purchase price as percentage of fair market value	85.00%
Eligible employees contribution of base compensation	10.00%
Employee stock purchase plan, shares purchased	171	170	141
Employee stock ownership plan, average purchase price of shares purchased	$ 99.41	$ 101.26	$ 112.31
Shares of our common stock reserved for issuance	1,000
Former Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation recovered due to forfeiture of awards			$ 41
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock price, as of year end (in dollars per share)	$ 108.14
Total intrinsic value of stock options exercised, value	$ 145	$ 107	$ 249
Vesting period	4 years
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
RSUs \| Share-based Payment Arrangement, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year
Vesting percentage	25.00%
RSUs \| Share-based Payment Arrangement, Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years

Current Income Tax Benefit Associated With Stock Based Awards.

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