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Capital Structure - Schedule of Changes in Stockholders' Deficit and Equity (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Capital Structure [Line Items]
Beginning Balances	$ (4,995)
Comprehensive income	1,363	$ 795
Repurchase of common stock	(423)
Dividends and distributions	(218)
Share-based benefit plans	(114)
Dispositions of entities with noncontrolling interests	(53)
Other	6
Ending Balances	(4,434)
Common Stock [Member]
Capital Structure [Line Items]
Beginning Balances	4
Ending Balances	$ 4
Beginning Balances, Shares	350,092,000
Repurchase of common stock, shares	(4,370,000)
Share-based benefit plans, Shares	5,265,000
Ending Balances, Shares	350,987,000
Accumulated Other Comprehensive Loss [Member]
Capital Structure [Line Items]
Beginning Balances	$ (278)
Comprehensive income	81
Ending Balances	(197)
Retained Deficit [Member]
Capital Structure [Line Items]
Beginning Balances	(6,532)
Comprehensive income	1,144
Repurchase of common stock	(423)
Dividends and distributions	(126)
Share-based benefit plans	(114)
Ending Balances	(6,051)
Equity Attributable to Noncontrolling Interests [Member]
Capital Structure [Line Items]
Beginning Balances	1,811
Comprehensive income	138
Dividends and distributions	(92)
Dispositions of entities with noncontrolling interests	(53)
Other	6
Ending Balances	$ 1,810

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Decrease in noncontrolling interest balance from payment of dividends or other distributions by the non-wholly owned subsidiary or partially owned entity, included in the consolidation of the parent entity, to the noncontrolling interest holders.

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The amount of the reduction or elimination during the period of a noncontrolling interest resulting from the parent's loss of control and deconsolidation of the entity in which one or more outside parties had a noncontrolling interest.

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Number of shares of stock issued as of the balance sheet date, including shares that had been issued and were previously outstanding but which are now held in the treasury.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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