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Derivative instruments - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Derivative Instruments Gain Loss [Line Items] |  |  |
Derivative Instrument, Term | 3 years |  |
Net Cash Provided by (Used in) Operating Activities | $ 9,261 | $ 10,497 | $ 9,150
Long-term debt |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Carrying amounts of hedged liabilities | 6,729 | 6,258 |
Foreign currency and cross currency swap contracts [Member] |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Amounts expected to be reclassified from AOCI into earnings over the next 12 months, foreign currency and cross-currency swaps | 19 |  |
Interest rate swap [Member] | Interest Expense [Member] |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Derivative, Gain on Derivative |  | 40 |
Interest Rate Swap, At-Then Current Interest Rates [Member] | Long-term debt |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Carrying amounts of hedged liabilities |  | 5,200 |
Derivatives designated as hedging instruments [Member] | Foreign currency forward contracts [Member] |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Notional amount | 5,700 | 5,100 | 5,000
Derivatives designated as hedging instruments [Member] | Interest rate swap [Member] |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Notional amount | 6,700 | 5,900 |
Derivative, Notional Amount, Amount Terminated | 750 | 3,650 |
Net Cash Provided by (Used in) Operating Activities |  | 576 |
Derivative Instrument, Aggregate Notional Amount of New Instruments | 1,500 |  |
Derivative, Notional Amount, Amount Terminated Resulting In Net Cash Provided By Operating Activities | 750 | 5,200 |
Derivatives designated as hedging instruments [Member] | Interest rate swap [Member] | Interest Rate Swap, Two [Member] |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Notional amount |  | 5,200 |
Derivatives not designated as hedging instruments [Member] | Foreign currency forward contracts [Member] |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Notional amount | $ 680 | $ 1,000 | $ 1,200
Notes [Member] | 2.125% 2019 Euro Notes |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Interest rate, stated percentage |  | 2.125% | 2.125%

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