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Goodwill and Other Intangibles (Intangible Rollforward) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Gross carrying amount
Beginning Balance, Gross	$ 907
Acquisition		$ 907
Ending Balance, Gross	907	907
Accumulated amortization
Beginning Balance, amortization	(112)
Amortization	(187)	(112)
Ending Balance, amortization	(299)	(112)
Net carrying amount
Beginning Balance, Net	795
Acquisition		907
Amortization	(187)	(112)
Ending Balance, Net	$ 608	$ 795

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.

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