Recent Accounting Guidance Cash Flow ASU - Statement of Cash Flow Impact (Details) - USD ($) $ in Millions	4 Months Ended
Dec. 31, 2017	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash and Cash Equivalents	$ 7,250	$ 4,466
Cash, Cash Equivalents, and Restricted Cash	7,808	$ 4,966
As Reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Payment into a trust account	(571)
Distribution from trust account	13
Net Cash Provided by (Used in) Investing Activities	2,210
Increase (Decrease) in Cash and Cash Equivalents	3,245
Cash and Cash Equivalents	7,250
Effect of Adoption of ASU 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Payment into a trust account	571
Distribution from trust account	(13)
Net Cash Provided by (Used in) Investing Activities	558
Increase (Decrease) in Cash and Cash Equivalents	558
Cash and Cash Equivalents	558
Updated [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Payment into a trust account	0
Distribution from trust account	0
Net Cash Provided by (Used in) Investing Activities	2,768
Increase (Decrease) in Cash and Cash Equivalents	$ 3,803

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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