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Financial Instruments - Reconciliation of recurring Level 3 fair value measurements (Details)
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Beginning balance $ 0
Additions as a result of business combination 179
Purchases 186
Proceeds at maturity (62)
Unrealized gains recognized in accumulated other comprehensive income (loss) 1
Ending balance $ 304