CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Current Assets:
Allowance for Uncollectible Accounts	$ 149	$ 156
Noncurrent Assets:
Accumulated Depreciation of Property, Plant and Equipment	7,423
Accumulated Amortization of Other Intangible Assets	$ 887
Shareholders’ Equity:
Common Shares, Par Value (in USD)	$ 0.001	$ 0.001
Common Shares, Authorized (in shares)	1,356,000,000	1,356,000,000
Common Shares, Conditionally Authorized (in shares)	0	0
Common Shares, Issued (in shares)	996,000,000	993,000,000
Common Stock, Outstanding (in shares)	996,000,000	993,000,000
Treasury Shares, at cost (in shares)	0	0