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Long-Term Debt and Credit Facilities - Expected Maturity Schedule of Debt (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Long-term Debt, Fiscal Year Maturity [Abstract]  
2019-2023 $ 3
2024-2043 702
2044-2063 0
2064-2083 450
Thereafter 430
Total 1,585
AGUS [Member]  
Long-term Debt, Fiscal Year Maturity [Abstract]  
2019-2023 0
2024-2043 700
2044-2063 0
2064-2083 150
Thereafter 0
Total 850
AGMH [Member]  
Long-term Debt, Fiscal Year Maturity [Abstract]  
2019-2023 0
2024-2043 0
2044-2063 0
2064-2083 300
Thereafter 430
Total 730
AGM [Member]  
Long-term Debt, Fiscal Year Maturity [Abstract]  
2019-2023 3
2024-2043 2
2044-2063 0
2064-2083 0
Thereafter 0
Total $ 5