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Stock-Based Compensation - Additional Information (Detail) $ / shares in Units, $ in Millions			3 Months Ended		6 Months Ended
	May 18, 2016 $ / shares shares	Feb. 24, 2016 $ / shares shares	Jun. 30, 2016 USD ($) shares	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) shares	Jun. 30, 2015 USD ($)
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			31,391,412		31,391,412
Stock-based compensation expense | $			$ 21	$ 22	$ 50	$ 62
Income tax benefit recognized | $			$ 5	$ 6	$ 12	13
Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock granted	44,520
Restricted stock granted fair value | $ / shares	$ 31.45
Period of option vested over grant date					The stock options vest over a three-year period from the grant date while the restricted stock and restricted stock units vest on the third anniversary of the date of grant.
Restricted Stock and Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock granted		1,732,095
Restricted stock granted fair value | $ / shares		$ 28.24
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock appreciation rights, vesting period		3 years
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 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 Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option granted		3,672,411
Stock option granted fair value | $ / shares		$ 6.44
Stock Options [Member] | Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option granted, exercise price | $ / shares		$ 28.24
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] | Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option granted		4,618,400
Stock option granted fair value | $ / shares		$ 6.44
Stock option granted, exercise price | $ / shares		$ 28.24
Performance-base restricted stock [Member] | Minimum [Member] | Senior Management Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock granted		0
Performance-base restricted stock [Member] | Maximum [Member] | Senior Management Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock granted		341,780
Voluntary Early Retirement Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense | $					$ 5	$ 18

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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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