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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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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4I -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4590271-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4568740-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4568447-111683 + Details
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