Debt - Long Term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total debt	$ 12,799	$ 13,299
Less: unamortized discounts and issuance costs	(1,123)	(1,130)
Total debt, net	11,676	12,169
Less: current portion	(6)	(500)
Long-term debt, net	$ 11,670	11,669
3.35% due 2021
Debt Instrument [Line Items]
Interest rate	3.35%
Total debt	$ 0	500
3.10% due 2023
Debt Instrument [Line Items]
Interest rate	3.10%
Total debt	$ 500	500
2.90% due 2025
Debt Instrument [Line Items]
Interest rate	2.90%
Total debt	$ 750	750
3.55% due 2026
Debt Instrument [Line Items]
Interest rate	3.55%
Total debt	$ 2,000	2,000
1.85% due 2030
Debt Instrument [Line Items]
Interest rate	1.85%
Total debt	$ 400	400
3.60% due 2035
Debt Instrument [Line Items]
Interest rate	3.60%
Total debt	$ 500	500
4.50% and 6.15% due 2036
Debt Instrument [Line Items]
Total debt	$ 1,054	1,054
4.50% and 6.15% due 2036 | Minimum
Debt Instrument [Line Items]
Interest rate	4.50%
4.50% and 6.15% due 2036 | Maximum
Debt Instrument [Line Items]
Interest rate	615.00%
4.07% due 2042
Debt Instrument [Line Items]
Interest rate	4.07%
Total debt	$ 1,336	1,336
3.80% due 2045
Debt Instrument [Line Items]
Interest rate	3.80%
Total debt	$ 1,000	1,000
4.70% due 2046
Debt Instrument [Line Items]
Interest rate	4.70%
Total debt	$ 1,326	1,326
2.80% due 2050
Debt Instrument [Line Items]
Interest rate	2.80%
Total debt	$ 750	750
4.09% due 2052
Debt Instrument [Line Items]
Interest rate	4.09%
Total debt	$ 1,578	1,578
Other notes with rates from 4.85% to 9.13%, due 2022 to 2041
Debt Instrument [Line Items]
Total debt	$ 1,605	$ 1,605
Other notes with rates from 4.85% to 9.13%, due 2022 to 2041 | Minimum
Debt Instrument [Line Items]
Interest rate	4.85%
Other notes with rates from 4.85% to 9.13%, due 2022 to 2041 | Maximum
Debt Instrument [Line Items]
Interest rate	9.13%