XML 373 R170.htm IDEA: XBRL DOCUMENT v3.10.0.1
Consolidated net cash/(debt) - Analysis of changes in consolidated net cash/(debt) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of financial liabilities [Abstract]    
Net debt at beginning balance $ (3,845) $ (9,587)
Foreign exchange adjustment 213 (70)
Cash movements excluding exchange movements, net debt 4,045 5,859
Other non-cash movements (158) (47)
Net debt at ending balance 255 (3,845)
Borrowings (including finance leases) Excluding Overdraft [Member]    
Disclosure of financial liabilities [Abstract]    
Financial liabilities, beginning balance (15,173) (17,618)
Foreign exchange adjustment 126 (303)
Cash movements excluding exchange movements 2,246 2,777
Other non-cash movements 50 (29)
Financial liabilities, ending balance (12,751) (15,173)
Debt-related derivatives (included in "Other financial assets/liabilities) [member]    
Disclosure of financial liabilities [Abstract]    
Financial liabilities, beginning balance (177) (408)
Foreign exchange adjustment (64) 245
Cash movements excluding exchange movements 51 7
Other non-cash movements (98) (21)
Financial liabilities, ending balance (288) (177)
Other Investments [Member]    
Disclosure of financial liabilities [Abstract]    
Cash and Overdrafts, Beginning balance 10,547 8,189
Foreign exchange adjustment 151 (12)
Cash movements excluding exchange movements 191 2,370
Other non-cash movements (117)  
Cash and Overdrafts, ending balance 10,772 10,547
Other Investments [Member]    
Disclosure of financial liabilities [Abstract]    
Cash and Overdrafts, Beginning balance 958 250
Cash movements excluding exchange movements 1,557 705
Other non-cash movements 7 3
Cash and Overdrafts, ending balance $ 2,522 $ 958