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Borrowings - Narrative (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Aug. 18, 2021 | Aug. 31, 2021 | Aug. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Debt Instrument [Line Items] |  |  |  |  |  |  |
Proceeds from issuance of long-term debt |  |  |  |  |  | $ 987,000,000 | $ 7,919,000,000
Loss on early extinguishment of debt |  |  |  | $ 363,000,000 | $ 766,000,000 | $ 363,000,000 | $ 766,000,000
Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Premium paid in excess of debt principal |  |  | $ 706,000,000 |  |  |  |
Write off of deferred debt issuance cost |  |  | 47,000,000 |  |  |  |
Debt Extinguishment Fees |  |  | 13,000,000 |  |  |  |
Loss on early extinguishment of debt |  |  | 766,000,000 |  |  |  |
Senior Notes | 2.125% senior notes due September 2031 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Face amount of debt | $ 1,000,000,000 |  |  |  |  |  |
Debt interest rate | 2.125% |  |  | 2.125% |  | 2.125% |
Proceeds from issuance of long-term debt | $ 987,000,000 |  |  |  |  |  |
Senior Notes | Senior Notes, 4.3%, Due 2028 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt interest rate |  | 4.30% |  |  |  |  |
Aggregate principal of debt extinguished |  | $ 2,000,000,000 |  |  |  |  |
Premium paid in excess of debt principal |  | 332,000,000 |  |  |  |  |
Write off of deferred debt issuance cost |  | 26,000,000 |  |  |  |  |
Debt Extinguishment Fees |  | 5,000,000 |  |  |  |  |
Loss on early extinguishment of debt |  | $ 363,000,000 |  |  |  |  |
Senior Notes | Outstanding Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate principal of debt extinguished |  |  | $ 6,000,000,000 |  |  |  |
Senior Notes | 4% senior notes due December 2023 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt interest rate |  |  | 4.00% | 4.00% |  | 4.00% |
Aggregate principal of debt extinguished |  |  | $ 723,000,000 |  |  |  |
Senior Notes | 3.7% senior notes due March 2023 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt interest rate |  |  | 3.70% | 3.70% |  | 3.70% |
Aggregate principal of debt extinguished |  |  | $ 2,300,000,000 |  |  |  |
Senior Notes | 4.1% senior notes due March 2025 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt interest rate |  |  | 4.10% | 4.10% |  | 4.10% |
Aggregate principal of debt extinguished |  |  | $ 3,000,000,000 |  |  |  |

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