Debt - Schedule of Debt (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Other bank borrowings	$ 25	$ 35
Obligations under finance leases	17	16
Total debt	15,810	17,709
Less current portion	37	11
Total long-term debt, net of current portion	15,773	17,698
Net unamortized discount on senior debt	451	466
Unamortized deferred financing costs	92	95
Face value of debt	$ 16,350	18,270
7.875% Debentures due 2023
Debt Instrument [Line Items]
Stated interest rate	7.875%
Carrying value of senior debt	$ 139	139
7.125% Senior Notes due 2023
Debt Instrument [Line Items]
Stated interest rate	7.125%
Carrying value of senior debt	$ 35	35
3.875% Senior Notes due 2024
Debt Instrument [Line Items]
Stated interest rate	3.875%
Carrying value of senior debt	$ 0	490
3.70% Senior Notes due 2024
Debt Instrument [Line Items]
Stated interest rate	3.70%
Carrying value of senior debt	$ 0	599
3.50% Senior Notes due 2025
Debt Instrument [Line Items]
Stated interest rate	3.50%
Carrying value of senior debt	$ 0	597
4.75% Senior Notes due 2025
Debt Instrument [Line Items]
Stated interest rate	4.75%
Carrying value of senior debt	$ 552	1,242
4.0% Senior Notes due 2026
Debt Instrument [Line Items]
Stated interest rate	4.00%
Carrying value of senior debt	$ 794	793
3.45% Senior Notes due 2026
Debt Instrument [Line Items]
Stated interest rate	3.45%
Carrying value of senior debt	$ 124	123
2.90% Senior Notes due 2027
Debt Instrument [Line Items]
Stated interest rate	2.90%
Carrying value of senior debt	$ 693	692
3.375% Senior Notes due 2028
Debt Instrument [Line Items]
Stated interest rate	3.375%
Carrying value of senior debt	$ 496	496
3.70% Senior Notes due 2028
Debt Instrument [Line Items]
Stated interest rate	3.70%
Carrying value of senior debt	$ 493	493
4.20% Senior Notes due 2029
Debt Instrument [Line Items]
Stated interest rate	4.20%
Carrying value of senior debt	$ 495	494
7.875% Senior Debentures due 2030
Debt Instrument [Line Items]
Stated interest rate	7.875%
Carrying value of senior debt	$ 830	830
4.95% Senior Notes due 2031
Debt Instrument [Line Items]
Stated interest rate	4.95%
Carrying value of senior debt	$ 1,224	1,223
4.20% Senior Notes due 2032
Debt Instrument [Line Items]
Stated interest rate	4.20%
Carrying value of senior debt	$ 973	972
5.50% Senior Debentures due 2033
Debt Instrument [Line Items]
Stated interest rate	5.50%
Carrying value of senior debt	$ 427	427
4.85% Senior Debentures due 2034
Debt Instrument [Line Items]
Stated interest rate	4.85%
Carrying value of senior debt	$ 87	87
6.875% Senior Debentures due 2036
Debt Instrument [Line Items]
Stated interest rate	6.875%
Carrying value of senior debt	$ 1,070	1,070
6.75% Senior Debentures due 2037
Debt Instrument [Line Items]
Stated interest rate	6.75%
Carrying value of senior debt	$ 75	75
5.90% Senior Notes due 2040
Debt Instrument [Line Items]
Stated interest rate	5.90%
Carrying value of senior debt	$ 298	298
4.50% Senior Debentures due 2042
Debt Instrument [Line Items]
Stated interest rate	4.50%
Carrying value of senior debt	$ 45	45
4.85% Senior Notes due 2042
Debt Instrument [Line Items]
Stated interest rate	4.85%
Carrying value of senior debt	$ 488	488
4.375% Senior Debentures due 2043
Debt Instrument [Line Items]
Stated interest rate	4.375%
Carrying value of senior debt	$ 1,126	1,123
4.875% Senior Debentures due 2043
Debt Instrument [Line Items]
Stated interest rate	4.875%
Carrying value of senior debt	$ 18	18
5.85% Senior Debentures due 2043
Debt Instrument [Line Items]
Stated interest rate	5.85%
Carrying value of senior debt	$ 1,233	1,233
5.25% Senior Debentures due 2044
Debt Instrument [Line Items]
Stated interest rate	5.25%
Carrying value of senior debt	$ 345	345
4.90% Senior Notes due 2044
Debt Instrument [Line Items]
Stated interest rate	4.90%
Carrying value of senior debt	$ 541	540
4.60% Senior Notes due 2045
Debt Instrument [Line Items]
Stated interest rate	4.60%
Carrying value of senior debt	$ 590	590
4.95% Senior Notes due 2050
Debt Instrument [Line Items]
Stated interest rate	4.95%
Carrying value of senior debt	$ 945	944
5.875% Junior Subordinated Debentures due 2057
Debt Instrument [Line Items]
Stated interest rate	5.875%
Junior subordinated notes	$ 0	514
6.25% Junior Subordinated Debentures due 2057
Debt Instrument [Line Items]
Stated interest rate	6.25%
Junior subordinated notes	$ 643	643
6.375% Junior Subordinated Debentures due 2062
Debt Instrument [Line Items]
Stated interest rate	6.375%
Junior subordinated notes	$ 989	$ 0
Face value of debt	$ 1,000

Amount of short-term and long-term debt and lease obligation.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount, after accumulated amortization, of debt discount (premium).

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Present value of lessee's discounted obligation for lease payments from finance lease.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Junior Subordinated Notes, which have a lower priority than senior instruments.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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