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Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items] |  |  |
Net income | [1] | $ 2,070 | $ 1,941
Class A common stock |  |  |
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items] |  |  |
Income Allocation (A) | [1] | $ 1,594 | $ 1,550
Weighted- Average Shares Outstanding (B) |  | 1,860 | 1,937
Earnings per Share (A)/(B) | [2] | $ 0.86 | $ 0.80
Income Allocation (A) | [1] | $ 2,070 | $ 1,941
Weighted- Average Shares Outstanding (B) | [3] | 2,421 | 2,430
Earnings per Share (A)/(B) | [2] | $ 0.86 | $ 0.80
Class B common stock |  |  |
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items] |  |  |
Income Allocation (A) | [1] | $ 347 | $ 324
Weighted- Average Shares Outstanding (B) |  | 245 | 245
Earnings per Share (A)/(B) | [2] | $ 1.41 | $ 1.32
Income Allocation (A) | [1] | $ 346 | $ 323
Weighted- Average Shares Outstanding (B) |  | 245 | 245
Earnings per Share (A)/(B) | [2] | $ 1.41 | $ 1.32
Class C common stock |  |  |
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items] |  |  |
Income Allocation (A) | [1] | $ 57 | $ 63
Weighted- Average Shares Outstanding (B) |  | 17 | 20
Earnings per Share (A)/(B) | [2] | $ 3.43 | $ 3.20
Income Allocation (A) | [1] | $ 57 | $ 63
Weighted- Average Shares Outstanding (B) |  | 17 | 20
Earnings per Share (A)/(B) | [2] | $ 3.42 | $ 3.20
Participating securities |  |  |
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items] |  |  |
Income Allocation (A) | [1],[4] | $ 72 | $ 4
Income Allocation (A) | [1],[4] | $ 72 | $ 4
[1] | Net income is allocated based on proportional ownership on an as-converted basis. The weighted-average number of shares of as-converted class B common stock used in the income allocation was 405 million for the three months ended December 31, 2016 and 2015. The weighted-average number of shares of as-converted class C common stock used in the income allocation was 67 million and 78 million for the three months ended December 31, 2016 and 2015, respectively. The weighted-average number of shares of as-converted U.K.&I and Europe preferred stock, included within participating securities, used in the income allocation was 35 million and 44 million, respectively, for the three months ended December 31, 2016.
[2] | Figures in the table may not recalculate exactly due to rounding. Earnings per share is calculated based on unrounded numbers.
[3] | Weighted-average diluted shares outstanding are calculated on an as-converted basis, and include incremental common stock equivalents, as calculated under the treasury stock method. The computation includes approximately 5 million common stock equivalents for the three months ended December 31, 2016 and 2015 because their effect would be dilutive. The computation excludes 3 million and 1 million of common stock equivalents for the three months ended December 31, 2016 and 2015, respectively, because their effect would have been anti-dilutive.
[4] | Participating securities include preferred stock outstanding and unvested share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents, such as the Company's U.K.&I and Europe preferred stock, restricted stock awards, restricted stock units and earned performance-based shares. Participating securities' income is allocated based on the weighted-average number of shares of as-converted stock.

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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=65016374&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1252-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1505-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1377-109256 + Details
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