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v3.20.2

Borrowings - Narrative (Details) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Aug. 21, 2020 | Mar. 31, 2020 | Aug. 31, 2020 | Mar. 31, 2020 | Aug. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from debt | $ 3,970,000,000 | $ 3,950,000,000 |  |  |  |  |  |  |  |
Derivative settlements |  |  |  | $ 7,000,000 |  |  |  | $ 7,000,000 | $ 25,000,000 |
Loss on net cash flow hedges |  |  |  | 5,000,000 |  |  |  |  |  |
Premium paid in excess of debt principal |  |  | $ 706,000,000 |  | $ 76,000,000 |  |  |  |  |
Debt extinguishment fees |  |  | 13,000,000 |  | 8,000,000 |  |  |  |  |
Write off of deferred debt issuance cost |  |  | 47,000,000 |  | 5,000,000 |  |  |  |  |
Loss on early extinguishment of debt |  |  | 766,000,000 |  | 79,000,000 | $ 766,000,000 | $ 79,000,000 | $ 766,000,000 | $ 79,000,000 |
Senior Notes | 1.3% senior notes due August 2027 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face amount of debt | $ 1,500,000,000 |  |  |  |  |  |  |  |  |
Debt interest rate | 1.30% |  |  |  |  | 1.30% |  | 1.30% |  |
Senior Notes | 1.75% senior notes due August 2030 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face amount of debt | $ 1,250,000,000 |  |  |  |  |  |  |  |  |
Debt interest rate | 1.75% |  |  |  |  | 1.75% |  | 1.75% |  |
Senior Notes | 2.7% senior notes due August 2040 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face amount of debt | $ 1,250,000,000 |  |  |  |  |  |  |  |  |
Debt interest rate | 2.70% |  |  |  |  | 2.70% |  | 2.70% |  |
Senior Notes | 3.625% senior notes due April 2027 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face amount of debt |  | $ 750,000,000 |  | $ 750,000,000 |  |  |  |  |  |
Debt interest rate |  | 3.625% |  | 3.625% |  | 3.625% |  | 3.625% |  |
Senior Notes | 3.75% senior notes due April 2030 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face amount of debt |  | $ 1,500,000,000 |  | $ 1,500,000,000 |  |  |  |  |  |
Debt interest rate |  | 3.75% |  | 3.75% |  | 3.75% |  | 3.75% |  |
Senior Notes | 4.125% senior notes due April 2040 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face amount of debt |  | $ 1,000,000,000.0 |  | $ 1,000,000,000.0 |  |  |  |  |  |
Debt interest rate |  | 4.125% |  | 4.125% |  | 4.125% |  | 4.125% |  |
Senior Notes | 4.25% senior notes due April 2050 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face amount of debt |  | $ 750,000,000 |  | $ 750,000,000 |  |  |  |  |  |
Debt interest rate |  | 4.25% |  | 4.25% |  | 4.25% |  | 4.25% |  |
Senior Notes | Outstanding Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate principal of debt extinguished |  |  | $ 6,000,000,000.0 |  | $ 4,000,000,000.0 |  |  |  |  |
Senior Notes | 3.125% senior notes due March 2020 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  |  |  | 3.125% |  |  |  |  | 3.125%
Aggregate principal of debt extinguished |  |  |  |  | $ 1,300,000,000 |  |  |  |  |
Senior Notes | 4.125% senior notes due May 2021 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  |  |  | 4.125% | 4.125% |  | 4.125% |  |
Aggregate principal of debt extinguished |  |  |  |  | $ 328,000,000 |  |  |  |  |
Senior Notes | 4.125% senior notes due June 2021 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  |  |  | 4.125% | 4.125% |  | 4.125% |  |
Aggregate principal of debt extinguished |  |  |  |  | $ 297,000,000 |  |  |  |  |
Senior Notes | 5.45% senior notes due June 2021 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  |  |  | 5.45% | 5.45% |  | 5.45% |  |
Aggregate principal of debt extinguished |  |  |  |  | $ 413,000,000 |  |  |  |  |
Senior Notes | 3.35% senior notes due March 2021 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  |  |  | 3.35% | 3.35% |  | 3.35% |  |
Aggregate principal of debt extinguished |  |  |  |  | $ 962,000,000 |  |  |  |  |
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% 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 | 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 |  |  | $ 3,000,000,000.0 |  |  |  |  |  |  |
Floating Rate Notes [Member] | Floating rate notes due March 2020 (2.515% at December 31, 2019) |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate principal of debt extinguished |  |  |  |  | $ 723,000,000 |  |  |  |  |

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