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Equity (Details) |  |  |  |  | 1 Months Ended | 3 Months Ended | 4 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 12, 2015 $ / shares | Jun. 25, 2014 USD ($) $ / shares shares | Jul. 25, 2013 $ / shares shares | Apr. 02, 2013 shares | Dec. 31, 2013 USD ($) $ / shares shares | Apr. 30, 2012 shares | Feb. 28, 2012 shares | Dec. 31, 2011 USD ($) shares | Jun. 30, 2015 USD ($) $ / shares shares | Jun. 30, 2014 USD ($) $ / shares shares | Mar. 31, 2013 shares | Jul. 25, 2013 $ / shares shares | Jun. 30, 2015 USD ($) $ / shares shares | Jun. 30, 2014 USD ($) $ / shares shares | Dec. 31, 2014 USD ($) $ / shares shares | Dec. 31, 2013 USD ($) $ / shares shares | Dec. 31, 2012 USD ($) agreements $ / shares shares | Jun. 30, 2015 USD ($) shares | Dec. 31, 2014 USD ($) $ / shares shares | Dec. 04, 2013 shares | Mar. 25, 2013 USD ($)
Dividend history |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly dividend rate (in usd per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.30 | $ 0.28 | $ 0.255 |  |  |  |
Annualized dividend rate (in usd per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.2 | 1.12 | 1.02 |  |  |  |
Special dividend (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 2.50 |  |  |  |
Dividends paid |  |  |  |  |  |  |  |  |  |  |  |  | $ 185,000,000 | $ 164,000,000 | $ 326,000,000 | $ 308,000,000 | $ 984,000,000 |  |  |  |
Share repurchases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total number of shares purchased (in shares) | shares |  |  |  |  |  |  |  |  | 1,600,000 | 2,200,000 |  |  | 2,600,000 | 4,400,000 |  |  |  |  |  |  |
Average price paid per share (in dollars per share) | $ / shares |  |  |  |  | $ 58.36 |  |  |  | $ 104.82 | $ 79.65 |  |  | $ 104.62 | $ 79.06 | $ 79.06 | $ 58.52 | $ 50.35 |  |  |  |
Total cash utilized |  |  |  |  |  |  |  |  |  |  |  |  | $ 273,000,000 |  | $ 346,000,000 | $ 989,000,000 | $ 298,000,000 |  |  |  |
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance as of December 31, 2013 |  |  |  |  | $ 810,000,000 |  |  |  | $ 810,000,000 |  |  |  | 810,000,000 |  | 810,000,000 | 810,000,000 |  | $ 810,000,000 | $ 810,000,000 |  |
Net income attributable to noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 |  | 92,000,000 |  |  |  |  |  |
Distributions to noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  | (34,000,000) |  | (91,000,000) | (22,000,000) | $ (223,000,000) |  |  |  |
Redemption value adjustment |  |  |  |  |  |  |  |  |  |  |  |  | 16,000,000 |  | (1,000,000) |  |  |  |  |  |
Balance as of December 31, 2014 |  |  |  |  | $ 810,000,000 |  |  |  | $ 810,000,000 |  |  |  | $ 810,000,000 |  | $ 810,000,000 | $ 810,000,000 |  |  |  |  |
Stockholders' Equity Note [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock authorized (shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 |  |
Preferred stock issued (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |
Par value of Preferred stock (in usd per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1 |  |
Quarterly dividend rate (in usd per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.30 | $ 0.28 | $ 0.255 |  |  |  |
Authorized amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000
Shares repurchased (in shares) | shares |  |  | 700,000 | 1,400,000 |  |  |  |  |  |  | 7,200,000 | 9,300,000 |  |  |  |  |  |  |  |  |
Volume weighted-average share price (in dollars per share) | $ / shares |  |  | $ 53.7995 |  |  |  |  |  |  |  |  | $ 53.7995 |  |  |  |  |  |  |  |  |
Average price paid per share (in dollars per share) | $ / shares |  |  |  |  | $ 58.36 |  |  |  | $ 104.82 | $ 79.65 |  |  | $ 104.62 | $ 79.06 | $ 79.06 | $ 58.52 | $ 50.35 |  |  |  |
Interest in joint venture minimum percentage |  |  |  |  |  |  |  |  |  |  |  |  | 20.00% |  | 20.00% |  |  |  |  |  |
Change in control period |  |  |  |  |  |  |  |  |  |  |  |  | 15 days |  | 15 days |  |  |  |  |  |
Total MHFI Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share repurchases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total cash utilized |  |  |  |  |  |  |  |  | $ 164,000,000 | $ 177,000,000 |  |  | $ 274,000,000 | $ 352,000,000 | $ 352,000,000 | $ 989,000,000 | $ 295,000,000 |  |  |  |
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions to noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ (223,000,000) |  |  |  |
2013 Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share repurchases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total number of shares purchased (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,400,000 | 0 | 0 |  |  |  |
Stockholders' Equity Note [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program number of shares authorized to be repurchased (shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 |
Maximum number of shares authorized for repurchase under stock repurchase plan as percentage of outstanding common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18.00% |
Remaining shares available under repurchase program | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 45,600,000.0 |  |
2011 Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share repurchases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total number of shares purchased (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 16,900,000 | 6,800,000 |  |  |  |
Stockholders' Equity Note [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program number of shares authorized to be repurchased (shares) | shares |  |  |  |  |  |  |  | 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum number of shares authorized for repurchase under stock repurchase plan as percentage of outstanding common stock |  |  |  |  |  |  |  | 17.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining shares available under repurchase program | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |
Number of agreements entered | agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |
Authorized amount |  |  |  |  |  |  |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Shares repurchased (in shares) | shares |  |  |  |  | 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares repurchased value |  |  |  |  | $ 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchases [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share repurchases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total cash utilized |  |  |  |  | $ 362,000,000 |  |  |  |  |  |  |  |  |  | $ 352,000,000 | $ 989,000,000 | $ 295,000,000 |  |  |  |
Uncollared ASR Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized amount |  |  |  |  |  |  |  | $ 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Shares repurchased (in shares) | shares |  |  |  |  |  |  | 800,000 | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Capped ASR Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized amount |  |  |  |  |  |  |  | $ 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Shares repurchased (in shares) | shares |  |  |  |  |  | 100,000 |  | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Harold W. McGraw III [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share repurchases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total number of shares purchased (in shares) | shares |  | 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase discount |  | 0.35% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average price paid per share (in dollars per share) | $ / shares |  | $ 82.66 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total cash utilized |  | $ 41,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average price paid per share (in dollars per share) | $ / shares |  | $ 82.66 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2013 Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share repurchases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total number of shares purchased (in shares) | shares |  |  |  |  | 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total cash utilized |  |  |  |  | $ 10,000,000 |  |  |  |  |  |  |  |  | $ 362,000,000 |  |  |  |  |  |  |
Stockholders' Equity Note [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program number of shares authorized to be repurchased (shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 |
Maximum number of shares authorized for repurchase under stock repurchase plan as percentage of outstanding common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18.00% |
Remaining shares available under repurchase program | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 42,900,000 |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend history |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly dividend rate (in usd per share) | $ / shares | $ 0.33 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly dividend rate (in usd per share) | $ / shares | $ 0.33 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph (12)(c) -URI http://asc.fasb.org/extlink&oid=27011957&loc=SL6540498-122764 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph (16)(c) -URI http://asc.fasb.org/extlink&oid=27011957&loc=SL6540498-122764 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph 15 -URI http://asc.fasb.org/extlink&oid=27011957&loc=SL6540498-122764 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph 14 -URI http://asc.fasb.org/extlink&oid=27011957&loc=SL6540498-122764 + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + 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 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate 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 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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- Definition Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method. + References Reference 1: 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=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 Reference 3: 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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