Quarterly Data - Schedule of Quarterly Data (Parenthetical) (Detail) (USD $)	3 Months Ended		12 Months Ended
	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2013
Income Statement [Abstract]
Goodwill impairment	$ 1,731,000,000		$ 1,731,000,000
Goodwill impairment after noncontrolling interest	1,719,000,000
Discrete income tax charge	372,000,000
Charges recorded of settlement amount	288,000,000	0
After-tax and noncontrolling interest	$ 243