Long-Term Debt (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Long-Term Debt	$ 4,890	$ 5,640
Finance Leases (see Note 18)	250	212
Less: Current Portion of Long-Term Debt	37	781
Unamortized Debt Discount	27	31
Debt Issuance Costs	4	5
Total Long-Term Debt	5,072	5,035
Proceeds from Debt, Net of Issuance Costs	1,480
Long-Term Debt by Maturity [Abstract]
Aggregate annual maturity of long-term debt (excluding capital lease obligations) in 2022	0
Aggregate annual maturity of long-term debt (excluding capital lease obligations) in 2023	1,250
Aggregate annual maturity of long-term debt (excluding capital lease obligations) in 2024	0
Aggregate annual maturity of long-term debt (excluding capital lease obligations) in 2025	500
Aggregate annual maturity of long-term debt (excluding capital lease obligations) in 2026	750
Line of Credit Facility [Line Items]
Proceeds from Debt, Net of Issuance Costs	$ 1,480
Eurodollar [Member]
Line of Credit Facility [Line Items]
Effective Interest Rate (in hundredths)	1.00%
Base Rate [Member]
Line of Credit Facility [Line Items]
Effective Interest Rate (in hundredths)	3.25%
Commercial Paper
Line of Credit Facility [Line Items]
Current Borrowings Outstanding	$ 0	0
Revolving Credit Agreement (New Facility)
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 2,000
Senior Unsecured Revolving Credit Agreement Due 2024
Line of Credit Facility [Line Items]
Line of Credit Facility, Expiration Date	Jun. 27, 2024
Line Of Credit Facility Increase Additional Borrowings	$ 3,000
Maximum total debt-to-total capitalization ratio allowed under financial covenant (in hundredths)	65.00%
4.100% Senior Notes due 2021
Debt Instrument [Line Items]
Long-Term Debt	$ 0	750
Debt Instrument Issuance Face Amount	$ 750
Debt Instrument Issuance Interest Rate	4.10%
2.625% Senior Notes due 2023
Debt Instrument [Line Items]
Long-Term Debt	$ 1,250	1,250
3.15% Senior Notes due 2025
Debt Instrument [Line Items]
Long-Term Debt	500	500
4.15% Senior Notes due 2026
Debt Instrument [Line Items]
Long-Term Debt	750	750
6.65% Senior Notes due 2028
Debt Instrument [Line Items]
Long-Term Debt	140	140
4.375% Senior Notes due 2030
Debt Instrument [Line Items]
Long-Term Debt	750	750
Debt Instrument Issuance Face Amount	$ 750
Debt Instrument Issuance Interest Rate	4.375%
3.90% Senior Notes due 2035
Debt Instrument [Line Items]
Long-Term Debt	$ 500	500
4.95% Senior Notes due 2050
Debt Instrument [Line Items]
Long-Term Debt	750	750
Debt Instrument Issuance Face Amount	$ 750
Debt Instrument Issuance Interest Rate	4.95%
Senior Notes Due 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument Issuance Face Amount	$ 500
Debt Instrument Issuance Interest Rate	2.45%
4.40% Senior Notes Due 2020
Debt Instrument [Line Items]
Debt Instrument Issuance Face Amount	$ 500
Debt Instrument Issuance Interest Rate	4.40%
5.10% Senior Notes due 2036
Debt Instrument [Line Items]
Long-Term Debt	$ 250	$ 250

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