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Accumulated Other Comprehensive Income (Loss) (Schedule Of Changes In Accumulated Other Comprehensive Income (Loss) By Component) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
AOCI, beginning balance     $ 10,728  
Other Comprehensive Income (Loss), Tax [Abstract]        
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent $ 1 $ 3 2 $ 8
Other Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]        
Other comprehensive income (loss) 50 (34) 147 11
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, before Tax, Including Portion Attributable to Noncontrolling Interest, Available-for-sale Securities   3   3
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Income Loss, Tax, Including Portion Attributable to Noncontrolling Interest, Available-for-sale Securities   (1)   (1)
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, Net of Tax, Portion Attributable to Parent, Available-for-sale Securities   2   2
AOCI, ending balance 10,483   10,483  
Foreign currency translation adjustments:        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
AOCI before tax, beginning balance (132) (70) (149) (90)
AOCI tax, beginning balance 0 0 0 0
AOCI, beginning balance (132) (70) (149) (90)
Other Comprehensive Income (Loss), before Tax [Abstract]        
Other comprehensive income loss, before tax 50 (29) 67 (9)
Other Comprehensive Income (Loss), Tax [Abstract]        
Other comprehensive income loss, tax 0 0 0 0
Other Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]        
Other comprehensive income (loss)   (29)   (9)
AOCI before tax, ending balance (82) (99) (82) (99)
AOCI tax, ending balance 0 0 0 0
AOCI, ending balance (82) (99) (82) (99)
Unrealized gains (losses) on available-for-sale investment securities:        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
AOCI before tax, beginning balance (4) 1 (6) (7)
AOCI tax, beginning balance 1 (1) 2 2
AOCI, beginning balance (3) 0 (4) (5)
Other Comprehensive Income (Loss), before Tax [Abstract]        
OCI, before reclassifications, before tax 1 5 3 13
Reclassification from AOCI, current period, before tax 0 (4) 0 (4)
Other comprehensive income loss, before tax 1 4 3 12
Other Comprehensive Income (Loss), Tax [Abstract]        
Other comprehensive income (loss) before reclassifications, tax 0 (1) (1) (4)
Reclassification from AOCI, current period, tax 0 1 0 1
Other comprehensive income loss, tax 0 (1) (1) (4)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent 1   2  
Other Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]        
OCI, before reclassifications, net of tax 1 4 2 9
Reclassification from AOCI, current period, net of tax 0 (3) 0 (3)
Other comprehensive income (loss)   3   8
AOCI before tax, ending balance (3) 5 (3) 5
AOCI tax, ending balance 1 (2) 1 (2)
AOCI, ending balance (2) 3 (2) 3
Unrealized gains (losses) on cash flow hedges:        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
AOCI before tax, beginning balance 155 10 51 (14)
AOCI tax, beginning balance (37) (2) (12) 2
AOCI, beginning balance 118 8 39 (12)
Other Comprehensive Income (Loss), before Tax [Abstract]        
OCI, before reclassifications, before tax 35 (7) 159 15
Other comprehensive income loss, before tax 0 (10) 104 14
Other Comprehensive Income (Loss), Tax [Abstract]        
Other comprehensive income (loss) before reclassifications, tax (9) 2 (39) (2)
Other comprehensive income loss, tax (1) 2 (26) (2)
Other Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]        
OCI, before reclassifications, net of tax 26 (5) 120 13
Other comprehensive income (loss) (1) (8) 78 12
AOCI before tax, ending balance 155 0 155 0
AOCI tax, ending balance (38) 0 (38) 0
AOCI, ending balance 117 0 117 0
Unrealized gains (losses) on cash flow hedges: | Cost of revenues        
Other Comprehensive Income (Loss), before Tax [Abstract]        
Reclassification from AOCI, current period, before tax (29) (3) (46) (1)
Other Comprehensive Income (Loss), Tax [Abstract]        
Reclassification from AOCI, current period, tax 7 0 11 0
Other Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]        
Reclassification from AOCI, current period, net of tax (22) (3) (35) (1)
Unrealized gains (losses) on cash flow hedges: | Selling, general and administrative expenses        
Other Comprehensive Income (Loss), before Tax [Abstract]        
Reclassification from AOCI, current period, before tax (6) 0 (9) 0
Other Comprehensive Income (Loss), Tax [Abstract]        
Reclassification from AOCI, current period, tax 1 0 2 0
Other Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]        
Reclassification from AOCI, current period, net of tax (5) 0 (7) 0
Accumulated other comprehensive income (loss):        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
AOCI before tax, beginning balance 19 (59) (104) (111)
AOCI tax, beginning balance (36) (3) (10) 4
AOCI, beginning balance (17) (62) (114) (107)
Other Comprehensive Income (Loss), before Tax [Abstract]        
Other comprehensive income loss, before tax 51 (35) 174 17
Other Comprehensive Income (Loss), Tax [Abstract]        
Other comprehensive income loss, tax (1) 1 (27) (6)
Other Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]        
Other comprehensive income (loss) 50 (34) 147 11
AOCI before tax, ending balance 70 (94) 70 (94)
AOCI tax, ending balance (37) (2) (37) (2)
AOCI, ending balance $ 33 $ (96) $ 33 $ (96)