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Capital Structure - Schedule of Changes in Stockholders' Deficit and Equity (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Capital Structure [Line Items] |  |  |  |
Beginning Balances |  |  | $ (5,633) |
Comprehensive income | $ 555 | $ 748 | 2,172 | $ 2,271
Repurchase of common stock |  |  | (1,475) |
Distributions |  |  | (363) |
Share-based benefit plans |  |  | 188 |
Other |  |  | 45 |
Ending Balances | (5,066) |  | (5,066) |
Common Stock [Member] |  |  |  |
Capital Structure [Line Items] |  |  |  |
Beginning Balances |  |  | 4 |
Ending Balances | $ 4 |  | $ 4 |
Beginning Balances, Shares |  |  | 370,536,000 |
Repurchase of common stock, shares |  |  | (17,847,000) |
Share-based benefit plans, Shares |  |  | 4,291,000 |
Ending Balances, Shares | 356,980,000 |  | 356,980,000 |
Capital in Excess of Par Value [Member] |  |  |  |
Capital Structure [Line Items] |  |  |  |
Repurchase of common stock |  |  | $ (185) |
Share-based benefit plans |  |  | 188 |
Other |  |  | (3) |
Accumulated Other Comprehensive Loss [Member] |  |  |  |
Capital Structure [Line Items] |  |  |  |
Beginning Balances |  |  | (338) |
Comprehensive income |  |  | 70 |
Ending Balances | $ (268) |  | (268) |
Retained Deficit [Member] |  |  |  |
Capital Structure [Line Items] |  |  |  |
Beginning Balances |  |  | (6,968) |
Comprehensive income |  |  | 1,742 |
Repurchase of common stock |  |  | (1,290) |
Ending Balances | (6,516) |  | (6,516) |
Equity Attributable to Noncontrolling Interests [Member] |  |  |  |
Capital Structure [Line Items] |  |  |  |
Beginning Balances |  |  | 1,669 |
Comprehensive income |  |  | 360 |
Distributions |  |  | (363) |
Other |  |  | 48 |
Ending Balances | $ 1,714 |  | $ 1,714 |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569616-111683 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591552-111686 + 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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