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Background and Basis of Presentation (Narrative) (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 5 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Sep. 30, 2020 | Apr. 29, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Oct. 28, 2021 | Jan. 31, 2021 | Apr. 30, 2020 | Jul. 31, 2019
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire additional interest in subsidiaries |  |  |  |  | $ 250,000,000 |  |  |  |  |  |  |
Common stock, dividend increase, percentage | 4.70% |  |  |  |  |  |  |  |  |  |  |
Dividends declared (usd per share) | $ 0.90 | $ 0.90 | $ 0.86 | $ 0.86 |  | $ 2.62 | $ 2.54 |  |  |  |  |
Common stock, dividend rate, annual (in usd per share) |  | $ 3.60 |  |  |  | $ 3.60 |  |  |  |  |  |
July 2019 Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Planned share repurchase program |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000
Stock repurchase program, rescinded authorized repurchase amount |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 |
Repurchase of common stock (shares) |  |  |  |  |  |  |  | 0 |  |  |  |
January 2021 Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Planned share repurchase program |  |  |  |  |  |  |  |  |  | $ 2,000,000,000 |  |
Repurchase of common stock (shares) |  | 6,700,000 |  |  |  | 20,200,000 |  |  |  |  |  |
Stock repurchase program, remaining authorized repurchase amount |  | $ 1,028,000,000 |  |  |  | $ 1,028,000,000 |  |  |  |  |  |
January 2021 Share Repurchase Program [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Planned share repurchase program |  |  |  |  |  |  |  |  | $ 3,500,000,000 |  |  |
Stock repurchase program, increase authorized amount |  |  |  |  |  |  |  |  | $ 1,500,000,000 |  |  |
Helix Innovations LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary ownership percentage |  |  |  |  | 100.00% |  |  |  |  |  |  |
Noncontrolling interest, remaining interest purchased by parent |  |  |  |  | 20.00% |  |  |  |  |  |  |

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