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Cash, Cash Equivalents, and Marketable Securities - Contractual Maturities (Details)
$ in Millions
Sep. 30, 2018
USD ($)
Amortized Cost  
Due within one year $ 18,390
Due after one year through five years 3,079
Due after five years through ten years 224
Due after ten years 481
Cash Equivalents and Marketable Fixed Income Securities, Cost 22,174
Estimated Fair Value  
Due within one year 18,380
Due after one year through five years 3,053
Due after five years through ten years 221
Due after ten years 471
Cash Equivalents and Marketable Fixed Income Securities, Fair Value $ 22,125