Short-Term Borrowings, Long-Term Debt and Available Credit Facilities Short-Term Borrowings and Capital Lease Obligations (Details) - USD ($) $ in Millions		Dec. 31, 2017	Dec. 31, 2016
Successor [Member]
Short-term Debt [Line Items]
Long-term Debt, Current Maturities	[1]	$ 1,315
Total short-term borrowings and capital lease obligations		2,779
Successor [Member] | Commercial Paper [Member]
Short-term Debt [Line Items]
Short-term Debt		1,436
Successor [Member] | Notes Payable to Banks [Member]
Short-term Debt [Line Items]
Short-term Debt		$ 28
Predecessor [Member]
Short-term Debt [Line Items]
Long-term Debt, Current Maturities			$ 4
Total short-term borrowings and capital lease obligations			429
Predecessor [Member] | Commercial Paper [Member]
Short-term Debt [Line Items]
Short-term Debt			386
Predecessor [Member] | Notes Payable to Banks [Member]
Short-term Debt [Line Items]
Short-term Debt			$ 39

[1] The Successor period includes the reflection of debt at fair value at the date of the Merger. See Note 3 for additional information regarding the Merger.