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Stock-Based Compensation - Additional Information (Detail) $ / shares in Units, $ in Millions			3 Months Ended		6 Months Ended
	May 17, 2017 $ / shares shares	Feb. 22, 2017 $ / shares shares	Jun. 30, 2017 USD ($) shares	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) shares	Jun. 30, 2016 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Earlier authorized shares under stock based compensation					69,400,000
Remaining shares available for future grants under the Plan			20,318,747		20,318,747
Stock-based compensation expense | $			$ 22	$ 21	$ 52	$ 50
Income tax benefit recognized | $			$ 5	$ 5	$ 9	12
Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	36,701
Restricted stock granted fair value | $ / shares	$ 33.38
Period of option vested over grant date					The stock options vest over a three-year period from the grant date. The restricted stock and restricted stock units vest on the third anniversary of the date of grant or in three equal annual installments commencing on the first anniversary of the date of grant.
Restricted Stock and Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted		1,504,450
Restricted stock granted fair value | $ / shares		$ 38.86
Stock option, vesting period		3 years
Stock Options and Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fungible shares issuance ratio					1
Other Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fungible shares issuance ratio					3
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period of option vested over grant date					The SARs are cash-settled awards and vest over a three-year period from the grant date.
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option granted		3,362,460
Stock option granted fair value | $ / shares		$ 10.98
Stock Options [Member] | Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option granted, exercise price | $ / shares		$ 38.86
Performance-base restricted stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance share awards, performance period		3 years
Performance-base restricted stock [Member] | Senior Management Employees [Member] | Restricted Stock and Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option granted		14,400
Performance-base restricted stock [Member] | Minimum [Member] | Senior Management Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted		0
Performance-base restricted stock [Member] | Maximum [Member] | Senior Management Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted		388,380
Voluntary Early Retirement Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense | $						$ 5

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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