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Stockholders' Equity Share Buyback Program (Details) - Predecessor [Member] - USD ($) $ in Millions | 6 Months Ended | 8 Months Ended | 12 Months Ended | 23 Months Ended | 43 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2016 | Aug. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2016 | Aug. 31, 2017 | Jan. 21, 2015 | Jan. 31, 2014
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Shares Repurchased and Retired During Period |  |  | (13,152,000) | (39,564,000) |  |  |  |
Payments for Repurchase of Common Stock |  | $ 0 | $ 916 | $ 2,353 |  |  |  |
2015 Share Buyback Plan [Member] |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
2015 Share Buy Back Announcement |  |  |  |  |  |  | $ 4,000 |
Shares Repurchased and Retired During Period | 13,200,000 |  | 48,200,000 |  |  |  |  |
Payments for Repurchase of Common Stock | $ 916 |  |  |  | $ 2,916 |  |  |
2014 Share Buyback Plan [Member] |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  | $ 5,000
Shares Repurchased and Retired During Period |  |  |  |  |  | 34,700,000 |  |
Payments for Repurchase of Common Stock |  |  |  |  |  | $ 2,353 |  |
Year ended December 31, 2015 [Member] | 2015 Share Buyback Plan [Member] |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  | $ 2,000 |
Year ended December 31, 2015 [Member] | 2014 Share Buyback Plan [Member] |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Shares Repurchased and Retired During Period |  |  |  | 4,600,000 |  |  |  |
Payments for Repurchase of Common Stock |  |  |  | $ 353 |  |  |  |

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- Definition A2015 Share Buy Back Announcement + References No definition available. + Details
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition Number of shares that have been repurchased and retired during the period. + 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 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 4: 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 + Details
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