Income Taxes - Expiration Periods for Deferred Tax Assets (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Income Tax Examination [Line Items]
Deferred tax liability arising from investments	$ 418	$ 0
State and Local Jurisdiction
Income Tax Examination [Line Items]
Net operating loss carryforwards	3,300
Foreign Tax Authority
Income Tax Examination [Line Items]
Net operating loss carryforwards	107
Tax credit carryforwards	17
Indefinite Tax Period | Domestic Tax Authority
Income Tax Examination [Line Items]
Net operating loss carryforwards	1,500
Expires from 2020 - 2037 | Domestic Tax Authority
Income Tax Examination [Line Items]
Net operating loss carryforwards	3,400
General Business Tax Credit Carryforward
Income Tax Examination [Line Items]
Tax credit carryforwards	241
KMP
Income Tax Examination [Line Items]
Investments in subsidiaries		$ 583
Deferred tax liability arising from investments	$ 48