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Financial Instruments - Investment Securities (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale, amortized cost $ 375 $ 391
Available-for-sale, gross unrealized gains 1 2
Available-for-sale, gross unrealized losses 0 0
Available-for-sale, estimated fair value 376 393
Non-U.S. debt securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale, amortized cost 309 310
Available-for-sale, gross unrealized gains 1 2
Available-for-sale, gross unrealized losses 0 0
Available-for-sale, estimated fair value 310 312
Equity securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale, amortized cost 66 81
Available-for-sale, gross unrealized gains 0 0
Available-for-sale, gross unrealized losses 0 0
Available-for-sale, estimated fair value $ 66 $ 81