Fair Value Measurements - Financial Instruments at Fair Value, Excluding Derivative Financial Instruments and Contingent Consideration (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014		Dec. 31, 2013
Fair Value
Financial assets:
Investments	$ 25		$ 336
Other assets	31		31
Total financial assets	56		367
Financial liabilities:
Long-term debt	3,691	[1]	3,306	[1]
Deferred credits and other liabilities	20		21
Total financial liabilities	3,711		3,327
Carrying Value
Financial assets:
Investments	2		14
Other assets	29		30
Total financial assets	31		44
Financial liabilities:
Long-term debt	3,254	[1]	3,001	[1]
Deferred credits and other liabilities	20		21
Total financial liabilities	$ 3,274		$ 3,022

[1] Excludes capital leases