Goodwill and Other Intangible Assets, net (Amortization Expense) (Details) $ in Millions	Jun. 30, 2019 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Estimated amortization expense, year one, assuming no additional transactions occur that require the amortization of intangible assets	$ 67
Estimated amortization expense, year two, assuming no additional transactions occur that require the amortization of intangible assets	67
Estimated amortization expense, year three, assuming no additional transactions occur that require the amortization of intangible assets	67
Estimated amortization expense, year four, assuming no additional transactions occur that require the amortization of intangible assets	67
Estimated amortization expense, year five, assuming no additional transactions occur that require the amortization of intangible assets	$ 67