Tangible Equity Units (Allocation of TEU) (Details)	Sep. 17, 2018 USD ($)
Tangible Equity Units [Line Items]
Fair Value per TEU	$ 50
Gross Proceeds	825,000,000
Less: Issuance costs	25,000,000
Net Proceeds	800,000,000
SPC
Tangible Equity Units [Line Items]
Fair Value per TEU	42
Gross Proceeds	686,000,000
Less: Issuance costs	21,000,000
Net Proceeds	665,000,000
Amortizing Note
Tangible Equity Units [Line Items]
Fair Value per TEU	8.45
Gross Proceeds	139,000,000
Less: Issuance costs	4,000,000
Net Proceeds	$ 135,000,000