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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (UNAUDITED) - USD ($) shares in Millions, $ in Millions | Total | Class A common stock | Preferred Stock | Preferred Stock UK&I preferred stock | Preferred Stock Europe preferred stock | Common Stock Class A common stock | Common Stock Class B common stock | Common Stock Class C common stock | Right to Recover for Covered Losses | Additional Paid-In Capital | Accumulated Income | Accumulated Other Comprehensive Income (Loss), Net
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Beginning balance (in shares) at Sep. 30, 2018 |  |  |  |  | 2 | 3 | 1,768 | 245 | 12 |  |  |  |  |
Beginning balance at Sep. 30, 2018 |  | $ 34,006 |  | $ 5,470 |  |  |  |  |  |  | $ (7) | $ 16,678 | $ 11,318 | $ 547
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | 5,954 |  |  |  |  |  |  |  |  |  |  | 5,954 |
Other comprehensive income (loss), net of tax |  | (640) |  |  |  |  |  |  |  |  |  |  |  | (640)
Comprehensive income |  | 5,314 |  |  |  |  |  |  |  |  |  |  |  |
Adoption of new accounting standards (Note 1) |  | 392 |  |  |  |  |  |  |  |  |  |  | 385 | 7
VE territory covered losses incurred (Note 5) |  | (162) |  |  |  |  |  |  |  |  | (162) |  |  |
Recovery through conversion rate adjustment (Note 5 and Note 10) |  |  |  | (6) |  |  |  |  |  |  | 6 |  |  |
Conversion of class C common stock upon sales into public market (in shares) |  |  |  |  |  |  | 1 |  | 0 | [1] |  |  |  |
Vesting of restricted stock and performance-based shares (in shares) |  |  |  |  |  |  | 3 |  |  |  |  |  |  |
Share-based compensation, net of forfeitures (Note 12) |  | 211 |  |  |  |  |  |  |  |  |  | 211 |  |
Restricted stock and performance-based shares settled in cash for taxes (in shares) |  |  |  |  |  |  | (1) |  |  |  |  |  |  |
Restricted stock and performance-based shares settled in cash for taxes |  | (103) |  |  |  |  |  |  |  |  |  | (103) |  |
Cash proceeds from issuance of common stock under employee equity plans (in shares) |  |  |  |  |  |  | 1 |  |  |  |  |  |  |
Cash proceeds from issuance of common stock under employee equity plans |  | 89 |  |  |  |  |  |  |  |  |  | 89 |  |
Cash dividends declared and paid, at a quarterly amount per Class A share |  | (1,141) |  |  |  |  |  |  |  |  |  |  | (1,141) |
Repurchase of class A common stock (Note 10) (in shares) |  |  | (31) |  |  |  | (31) |  |  |  |  |  |  |
Repurchase of class A common stock (Note 10) |  | (4,331) | $ (4,331) |  |  |  |  |  |  |  |  | (328) | (4,003) |
Ending balance (in shares) at Mar. 31, 2019 |  |  |  |  | 2 | 3 | 1,741 | 245 | 12 |  |  |  |  |
Ending balance at Mar. 31, 2019 |  | 34,275 |  | 5,464 |  |  |  |  |  |  | (163) | 16,547 | 12,513 | (86)
Beginning balance (in shares) at Dec. 31, 2018 |  |  |  |  | 2 | 3 | 1,754 | 245 | 12 |  |  |  |  |
Beginning balance at Dec. 31, 2018 |  | 34,095 |  | 5,464 |  |  |  |  |  |  | (92) | 16,540 | 11,908 | 275
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | 2,977 |  |  |  |  |  |  |  |  |  |  | 2,977 |
Other comprehensive income (loss), net of tax |  | (361) |  |  |  |  |  |  |  |  |  |  |  | (361)
Comprehensive income |  | 2,616 |  |  |  |  |  |  |  |  |  |  |  |
Adoption of new accounting standards (Note 1) |  | (8) |  |  |  |  |  |  |  |  |  |  | (8) |
VE territory covered losses incurred (Note 5) |  | (71) |  |  |  |  |  |  |  |  | (71) |  |  |
Conversion of class C common stock upon sales into public market (in shares) |  |  |  |  |  |  | 1 |  | 0 | [1] |  |  |  |
Vesting of restricted stock and performance-based shares (in shares) | [1] |  |  |  |  |  | 0 |  |  |  |  |  |  |
Share-based compensation, net of forfeitures (Note 12) |  | 111 |  |  |  |  |  |  |  |  |  | 111 |  |
Restricted stock and performance-based shares settled in cash for taxes (in shares) | [1] |  |  |  |  |  | 0 |  |  |  |  |  |  |
Restricted stock and performance-based shares settled in cash for taxes |  | (2) |  |  |  |  |  |  |  |  |  | (2) |  |
Cash proceeds from issuance of common stock under employee equity plans (in shares) | [1] |  |  |  |  |  | 0 |  |  |  |  |  |  |
Cash proceeds from issuance of common stock under employee equity plans |  | 41 |  |  |  |  |  |  |  |  |  | 41 |  |
Cash dividends declared and paid, at a quarterly amount per Class A share |  | (569) |  |  |  |  |  |  |  |  |  |  | (569) |
Repurchase of class A common stock (Note 10) (in shares) |  |  | (14) |  |  |  | (14) |  |  |  |  |  |  |
Repurchase of class A common stock (Note 10) |  | (1,938) | $ (1,938) |  |  |  |  |  |  |  |  | (143) | (1,795) |
Ending balance (in shares) at Mar. 31, 2019 |  |  |  |  | 2 | 3 | 1,741 | 245 | 12 |  |  |  |  |
Ending balance at Mar. 31, 2019 |  | 34,275 |  | 5,464 |  |  |  |  |  |  | (163) | 16,547 | 12,513 | (86)
Beginning balance (in shares) at Sep. 30, 2019 |  |  |  |  | 2 | 3 | 1,718 | 245 | 11 |  |  |  |  |
Beginning balance at Sep. 30, 2019 |  | 34,684 |  | 5,462 |  |  |  |  |  |  | (171) | 16,541 | 13,502 | (650)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | 6,356 |  |  |  |  |  |  |  |  |  |  | 6,356 |
Other comprehensive income (loss), net of tax |  | 231 |  |  |  |  |  |  |  |  |  |  |  | 231
Comprehensive income |  | 6,587 |  |  |  |  |  |  |  |  |  |  |  |
Adoption of new accounting standards (Note 1) |  | 0 |  |  |  |  |  |  |  |  |  |  | 25 | (25)
VE territory covered losses incurred (Note 5) |  | (13) |  |  |  |  |  |  |  |  | (13) |  |  |
Conversion of class C common stock upon sales into public market (in shares) |  |  |  |  |  |  | 3 |  | 0 |  |  |  |  |
Vesting of restricted stock and performance-based shares (in shares) |  |  |  |  |  |  | 3 |  |  |  |  |  |  |
Share-based compensation, net of forfeitures (Note 12) |  | 215 |  |  |  |  |  |  |  |  |  | 215 |  |
Restricted stock and performance-based shares settled in cash for taxes (in shares) |  |  |  |  |  |  | 1 |  |  |  |  |  |  |
Restricted stock and performance-based shares settled in cash for taxes |  | (155) |  |  |  |  |  |  |  |  |  | (155) |  |
Cash proceeds from issuance of common stock under employee equity plans (in shares) |  |  |  |  |  |  | 1 |  |  |  |  |  |  |
Cash proceeds from issuance of common stock under employee equity plans |  | 109 |  |  |  |  |  |  |  |  |  | 109 |  |
Cash dividends declared and paid, at a quarterly amount per Class A share |  | (1,339) |  |  |  |  |  |  |  |  |  |  | (1,339) |
Repurchase of class A common stock (Note 10) (in shares) |  |  | (31) |  |  |  | (31) |  |  |  |  |  |  |
Repurchase of class A common stock (Note 10) |  | (5,503) | $ (5,503) |  |  |  |  |  |  |  |  | (325) | (5,178) |
Ending balance (in shares) at Mar. 31, 2020 |  |  |  |  | 2 | 3 | 1,693 | 245 | 11 |  |  |  |  |
Ending balance at Mar. 31, 2020 |  | 34,585 |  | 5,462 |  |  |  |  |  |  | (184) | 16,385 | 13,366 | (444)
Beginning balance (in shares) at Dec. 31, 2019 |  |  |  |  | 2 | 3 | 1,709 | 245 | 11 |  |  |  |  |
Beginning balance at Dec. 31, 2019 |  | 35,270 |  | 5,462 |  |  |  |  |  |  | (175) | 16,424 | 13,899 | (340)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | 3,084 |  |  |  |  |  |  |  |  |  |  | 3,084 |
Other comprehensive income (loss), net of tax |  | (104) |  |  |  |  |  |  |  |  |  |  |  | (104)
Comprehensive income |  | 2,980 |  |  |  |  |  |  |  |  |  |  |  |
VE territory covered losses incurred (Note 5) |  | (9) |  |  |  |  |  |  |  |  | (9) |  |  |
Conversion of class C common stock upon sales into public market (in shares) |  |  |  |  |  |  | 2 |  | 0 | [1] |  |  |  |
Vesting of restricted stock and performance-based shares (in shares) |  |  |  |  |  |  | 0 |  |  |  |  |  |  |
Share-based compensation, net of forfeitures (Note 12) |  | 99 |  |  |  |  |  |  |  |  |  | 99 |  |
Restricted stock and performance-based shares settled in cash for taxes (in shares) |  |  |  |  |  |  | 0 |  |  |  |  |  |  |
Restricted stock and performance-based shares settled in cash for taxes |  | (8) |  |  |  |  |  |  |  |  |  | (8) |  |
Cash proceeds from issuance of common stock under employee equity plans (in shares) |  |  |  |  |  |  | 0 |  |  |  |  |  |  |
Cash proceeds from issuance of common stock under employee equity plans |  | 54 |  |  |  |  |  |  |  |  |  | 54 |  |
Cash dividends declared and paid, at a quarterly amount per Class A share |  | (668) |  |  |  |  |  |  |  |  |  |  | (668) |
Repurchase of class A common stock (Note 10) (in shares) |  |  | (18) |  |  |  | (18) |  |  |  |  |  |  |
Repurchase of class A common stock (Note 10) |  | (3,133) | $ (3,133) |  |  |  |  |  |  |  |  | (184) | (2,949) |
Ending balance (in shares) at Mar. 31, 2020 |  |  |  |  | 2 | 3 | 1,693 | 245 | 11 |  |  |  |  |
Ending balance at Mar. 31, 2020 |  | $ 34,585 |  | $ 5,462 |  |  |  |  |  |  | $ (184) | $ 16,385 | $ 13,366 | $ (444)
[1] | Increase or decrease is less than one million shares.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4568740-111683 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4I -URI http://asc.fasb.org/extlink&oid=116874947&loc=SL4590271-111686 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4568447-111683 + Details
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- Definition Recovery Through Conversion Rate Adjustment + References No definition available. + Details
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- Definition Stock Issued During Period Shares Employee Stock Purchase Plans and Stock Options Exercised + References No definition available. + Details
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- Definition Stock Issued During Period, Value, Employee Stock Purchase Plans and Stock Options Exercised + References No definition available. + Details
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- Definition Stock Issued and Vested During Period, Shares, Restricted Stock and Perfomance-based Stock Awards + References No definition available. + Details
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