Shareholders' Equity - Additional Information (Detail) - USD ($)	1 Months Ended								3 Months Ended								12 Months Ended
	Jan. 31, 2017	Nov. 30, 2016	Oct. 31, 2016	Aug. 31, 2016	Jun. 30, 2016	May 31, 2016	Apr. 30, 2016	Feb. 29, 2016	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Jul. 31, 2012
Stockholders Equity Note [Line Items]
Authorized shares available for future awards under the stock-based compensation plans													35,000,000					35,000,000
Shares available for future awards under the stock-based compensation plans									46,000,000								46,000,000
Stock compensation expense																	$ 115,000,000	$ 126,000,000	$ 126,000,000
Tax benefit related to stock based compensation																	34,000,000	38,000,000	41,000,000
Realized excess tax benefits from stock issued under employee benefit plans																	$ 39,000,000	$ 7,000,000	$ 15,000,000
Cash dividends declared per common share		$ 0.13		$ 0.13		$ 0.13		$ 0.115	$ 0.13	$ 0.13	$ 0.13	$ 0.115	$ 0.115	$ 0.115	$ 0.52	$ 0.52	$ 0.505	$ 1.27	$ 2.05
Cash dividends paid per common share			$ 0.13		$ 0.13		$ 0.115
Cash dividends declared per common share annualized basis				$ 0.52		$ 0.52		$ 0.46
Share repurchases																	6,300,000	0	8,000,000
Value of share repurchases																	$ 287,000,000		$ 600,000,000
Stock repurchase program, authorized amount																				$ 2,000,000,000
Stock repurchase program, additional authorized amount		$ 1,500,000,000
Remaining value available under stock repurchase programs									$ 1,700,000,000								$ 1,700,000,000
Subsequent Event
Stockholders Equity Note [Line Items]
Cash dividends paid per common share	$ 0.13
Stock Options
Stockholders Equity Note [Line Items]
Exercise prices of stock options granted to employees and non employee directors																	Equal to 100% of the market value
Stock options granted contractual term																	10 years
Total intrinsic value of stock options exercised																	$ 162,000,000	$ 43,000,000	$ 114,000,000
Unrecognized compensation cost related to all unvested									45,000,000								$ 45,000,000
Weighted-average period for all unvested																	1 year 3 months 18 days
Stock Options And Restricted Stock Units To Employees
Stockholders Equity Note [Line Items]
Stock options and RSUs vesting period																	One-third increments over a three-year period
Stock Options And Restricted Stock Units To Non Employee Directors
Stockholders Equity Note [Line Items]
Stock options and RSUs vesting period																	One year from the grant date
Restricted Stock Units
Stockholders Equity Note [Line Items]
Unrecognized compensation cost related to all unvested									49,000,000								$ 49,000,000
Weighted-average period for all unvested																	1 year 4 months 24 days
Weighted average fair value																	$ 40.32	$ 66.65	$ 71.22
Fair value of RSUs and restricted stock vested																	$ 50,000,000	$ 73,000,000	$ 62,000,000
Performance Shares
Stockholders Equity Note [Line Items]
Unrecognized compensation cost related to all unvested									$ 9,000,000								$ 9,000,000
Weighted-average period for all unvested																	1 year 10 months 24 days
Weighted average fair value																	$ 45.83
Target service period																	3 years
Employee Stock Purchase Plan
Stockholders Equity Note [Line Items]
Authorized shares available for future awards under the stock-based compensation plans									10,000,000								10,000,000
Shares available for future awards under the stock-based compensation plans									5,000,000								5,000,000
Employee purchase price																	85% of the closing market price on the purchase date.
Share issued, ESPP																	1,000,000	1,100,000	800,000
Shares under Subscription, ESPP									1,000,000								1,000,000
Marketing and Administrative Expenses
Stockholders Equity Note [Line Items]
Stock compensation expense allocation percentage																	70.00%	70.00%