Debt Obligations (Changes in Debt Obligations) (Details) $ in Millions	3 Months Ended
Mar. 31, 2022 USD ($)
Changes In Short-Term Debt Obligations [Roll Forward]
Short-term debt - commercial paper beginning balance	$ 1,517
Additions	1,250
Payments, Foreign Currency Translation and Accretion	(1,669)
Short-term debt - commercial paper ending balance	1,098
Changes in Long-Term Debt Obligations [Roll Forward]
Total long-term debt at beginning of period	4,313
Additions	541
Payments, Foreign Currency Translation and Accretion	(54)
Total long-term debt at end of period	4,800
Changes In Debt Obligations [Roll Forward]
Total debt obligations at beginning of period	5,830
Additions	1,791
Payments, Foreign Currency Translation and Accretion	(1,723)
Total debt obligations at end of period	5,898
Senior Notes \| 2026 Notes
Changes in Long-Term Debt Obligations [Roll Forward]
Long-term debt obligations at beginning of period	498
Additions	0
Payments, Foreign Currency Translation and Accretion	0
Long-term debt obligations at end of period	498
Senior Notes \| 2029 Notes
Changes in Long-Term Debt Obligations [Roll Forward]
Long-term debt obligations at beginning of period	676
Additions	0
Payments, Foreign Currency Translation and Accretion	(18)
Long-term debt obligations at end of period	658
Senior Notes \| 2030 Notes
Changes in Long-Term Debt Obligations [Roll Forward]
Long-term debt obligations at beginning of period	676
Additions	0
Payments, Foreign Currency Translation and Accretion	(18)
Long-term debt obligations at end of period	658
Senior Notes \| 2050 Notes
Changes in Long-Term Debt Obligations [Roll Forward]
Long-term debt obligations at beginning of period	486
Additions	0
Payments, Foreign Currency Translation and Accretion	0
Long-term debt obligations at end of period	486
Senior Notes \| 2031 Notes
Changes in Long-Term Debt Obligations [Roll Forward]
Long-term debt obligations at beginning of period	643
Additions	0
Payments, Foreign Currency Translation and Accretion	0
Long-term debt obligations at end of period	643
Senior Notes \| 2040 Notes
Changes in Long-Term Debt Obligations [Roll Forward]
Long-term debt obligations at beginning of period	644
Additions	0
Payments, Foreign Currency Translation and Accretion	0
Long-term debt obligations at end of period	644
Senior Notes \| 2033 Notes
Changes in Long-Term Debt Obligations [Roll Forward]
Long-term debt obligations at beginning of period	694
Additions	0
Payments, Foreign Currency Translation and Accretion	(19)
Long-term debt obligations at end of period	675
Senior Notes \| 2052 Notes
Changes in Long-Term Debt Obligations [Roll Forward]
Long-term debt obligations at beginning of period	0
Additions	541
Payments, Foreign Currency Translation and Accretion	0
Long-term debt obligations at end of period	541
2020 Credit Facility
Changes in Long-Term Debt Obligations [Roll Forward]
Long-term debt obligations at beginning of period	(4)
Additions	0
Payments, Foreign Currency Translation and Accretion	1
Long-term debt obligations at end of period	(3)
Short-term debt - commercial paper
Changes In Short-Term Debt Obligations [Roll Forward]
Short-term debt - commercial paper beginning balance	420
Additions	1,250
Payments, Foreign Currency Translation and Accretion	(1,670)
Short-term debt - commercial paper ending balance	0
Short-term notes \| 2022 Notes
Changes In Short-Term Debt Obligations [Roll Forward]
Short-term debt - commercial paper beginning balance	598
Additions	0
Payments, Foreign Currency Translation and Accretion	1
Short-term debt - commercial paper ending balance	599
Short-term notes \| 2024 Notes
Changes In Short-Term Debt Obligations [Roll Forward]
Short-term debt - commercial paper beginning balance	499
Additions	0
Payments, Foreign Currency Translation and Accretion	0
Short-term debt - commercial paper ending balance	$ 499

Changes In Debt Obligations [Roll Forward]

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Payments (Accretions) And Other Of Long-Term And Short-Term Debt

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Represents the aggregate of total long-term debt, including current maturities and short-term debt.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

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